Because of just how goblins are, there are LOTS of insurrections, a angry sesspit of power hungry folks is sure to boil over. I personally think they need a sheriff and militia generated positions too for civs in order to keep the balance of power. If a expedition leader to 'own' a site is set with modding, between every dark pit and tower, they'll all be a faction opposed to the capital in some way or form via a intrigue of power and also having egible [FORTIFICATIONS] for taking titles inside the goblin civ making the 'master' a target and actually claimable position.
Having a police force by modding in a site militia equivalent (and/or in the same militia role keeps things in check with [RESPONSIBLITY: LAW_ENFORCMENT) because the only law goblins endorse and punish via captial is treason. I like to personally make my goblin executioners axemen because they have access to a wider variety of giant axes and its more fun overall and also champions because that's also appropriate.
Goblin militias will roam around sites patrolling with these enhancements, if you make them even the tiniest bit upset with a unsheathed weapon or a wrong move they'll kill you in lethal combat, otherwise you can walk around at your own discretion with lots of grumbly goblins (this is affected by [KILL ENEMY:REQUIRED and KILL NEUTRAL:PERSONAL MATTER] which checks if the personal unit has any explicit reason to fight and kill enemy required forces no-quarter combat with enemies. Make a attempt on their master within range and the military goblins will swarm to punish you.
My methods of making local militia also means i can embark as a hearth-soldier from within my modded goblin civ raws which have all pops controllable and site controllable so i start off from inside the civ.
[POSITION:LIEUTENANT]
[NAME:high warband lieutenant:high warband lieutenants]
[NUMBER:AS_NEEDED]
[SQUAD:10:high warband guard:warband legion]
[APPOINTED_BY:GENERAL]
[COMMANDER:WARBAND_COMMANDER:ALL]
[COMMANDER:OVERSEER_WARBAND_COMMANDER:ALL]
[PRECEDENCE:100]
[MENIAL_WORK_EXEMPTION]
[FLASHES]
[BRAG_ON_KILL]
[CHAT_WORTHY]
[DO_NOT_CULL]
[KILL_QUEST]
[ACCOUNT_EXEMPT]
[DUTY_BOUND]
[DEMAND_MAX:1]
[REQUIRED_BOXES:1]
[REQUIRED_CABINETS:1]
[REQUIRED_RACKS:2]
[REQUIRED_STANDS:2]
[REQUIRED_OFFICE:100]
[REQUIRED_BEDROOM:100]
[REQUIRED_DINING:100]
[MILITARY_SCREEN_ONLY]
[POSITION:WARBAND_COMMANDER]
[NAME:warband commander:warband commanders]
[SITE]
[NUMBER:1]
[SQUAD:10:militia-warrior:warband-battalion]
[APPOINTED_BY:EXPEDITION_DESPOT]
[RESPONSIBILITY:MILITARY_STRATEGY]
[RESPONSIBILITY:LAW_ENFORCEMENT]
[COMMANDER:WARBAND_CAPTAIN:ALL]
[PRECEDENCE:120]
[DO_NOT_CULL]
[DUTY_BOUND]
[POSITION:WARBAND_CAPTAIN]
[NAME:warband captain:warband captains]
[SITE]
[NUMBER:AS_NEEDED]
[SQUAD:15:warband-warrior:warband-battalion]
[APPOINTED_BY:WARBAND_COMMANDER]
[PRECEDENCE:200]
[DO_NOT_CULL]
[DUTY_BOUND]
[MILITARY_SCREEN_ONLY]
[POSITION:EXPEDITION_DESPOT]
[NAME:despot:despots]
[SITE]
[NUMBER:1]
[RULES_FROM_LOCATION]
[RESPONSIBILITY:MEET_WORKERS]
[RESPONSIBILITY:RECEIVE_DIPLOMATS]
[RESPONSIBILITY:MILITARY_GOALS]
[KILL_QUEST]
[PRECEDENCE:110]
[DO_NOT_CULL]
[ACCOUNT_EXEMPT]
[DUTY_BOUND]
[POSITION:QUARTERMASTER]
[NAME:quartermaster:quartermasters]
[SITE]
[REQUIRES_MARKET]
[NUMBER:1]
[RESPONSIBILITY:MANAGE_PRODUCTION]
[APPOINTED_BY:EXPEDITION_DESPOT]
[PRECEDENCE:160]
[DO_NOT_CULL]
[COLOR:5:0:0]
[DUTY_BOUND]
[REQUIRED_OFFICE:100]
[POSITION:WARBAND_PRACTITIONER]
[NAME:warband practitioner:warband practitioners]
[SITE]
[REQUIRES_MARKET]
[NUMBER:1]
[RESPONSIBILITY:HEALTH_MANAGEMENT]
[APPOINTED_BY:EXPEDITION_DESPOT]
[PRECEDENCE:165]
[DO_NOT_CULL]
[COLOR:5:0:0]
[DUTY_BOUND]
[POSITION:BROKER]
[NAME:broker:brokers]
[SITE]
[REQUIRES_MARKET]
[NUMBER:1]
[RESPONSIBILITY:TRADE]
[APPOINTED_BY:EXPEDITION_DESPOT]
[PRECEDENCE:170]
[DO_NOT_CULL]
[COLOR:5:0:0]
[DUTY_BOUND]
[POSITION:WARBAND_ACCOUNTANT]
[NAME:warband accountant:warband accountants]
[SITE]
[REQUIRES_MARKET]
[NUMBER:1]
[RESPONSIBILITY:ACCOUNTING]
[APPOINTED_BY:EXPEDITION_DESPOT]
[PRECEDENCE:180]
[DO_NOT_CULL]
[COLOR:5:0:0]
[DUTY_BOUND]
[REQUIRED_OFFICE:100]
[POSITION:WARBAND_EXECUTIONER]
[NAME:warband executioner:warband executioners]
[SITE]
[REQUIRES_MARKET]
[NUMBER:1]
[RESPONSIBILITY:BUILD_MORALE]
[RESPONSIBILITY:EXECUTIONS]
[EXECUTION_SKILL:AXE]
[APPOINTED_BY:EXPEDITION_DESPOT]
[PRECEDENCE:65]
[MENIAL_WORK_EXEMPTION]
[PUNISHMENT_EXEMPTION]
[DO_NOT_CULL]
[COLOR:7:0:1]
[ACCOUNT_EXEMPT]
[DUTY_BOUND]
[DEMAND_MAX:1]
[POSITION:ELECTED_OUTPOST_LIAISON]
[NAME:warband diplomatic consul:warband diplomatic consuls]
[NUMBER:1]
[RESPONSIBILITY:ESTABLISH_COLONY_TRADE_AGREEMENTS]
[RESPONSIBILITY:MAKE_INTRODUCTIONS]
[RESPONSIBILITY:MAKE_PEACE_AGREEMENTS]
[RESPONSIBILITY:MAKE_TOPIC_AGREEMENTS]
[RESPONSIBILITY:TRADE]
[ELECTED]
[PRECEDENCE:80]
[MENIAL_WORK_EXEMPTION]
[SLEEP_PRETENSION]
[PUNISHMENT_EXEMPTION]
[ACCOUNT_EXEMPT]
[DO_NOT_CULL]
[COLOR:7:0:1]
[DUTY_BOUND]
[DEMAND_MAX:3]
[REQUIRED_BOXES:3]
[REQUIRED_CABINETS:2]
[REQUIRED_RACKS:2]
[REQUIRED_STANDS:2]
[REQUIRED_OFFICE:1500]
[REQUIRED_BEDROOM:1500]
[REQUIRED_DINING:1500]
[POSITION:WARBAND_OVERSEER]
[NAME:warband overseer:warband overseers]
[CONQUERED_SITE]
[FLASHES]
[BRAG_ON_KILL]
[CHAT_WORTHY]
[DO_NOT_CULL]
[KILL_QUEST]
[EXPORTED_IN_LEGENDS]
[MENIAL_WORK_EXEMPTION]
[SLEEP_PRETENSION]
[PUNISHMENT_EXEMPTION]
[ACCOUNT_EXEMPT]
[DUTY_BOUND]
[COLOR:5:0:0]
[MANDATE_MAX:2]
[DEMAND_MAX:3]
[PRECEDENCE:65]
[NUMBER:1]
[RESPONSIBILITY:LAW_MAKING]
[RESPONSIBILITY:RECEIVE_DIPLOMATS]
[RESPONSIBILITY:MAKE_TOPIC_AGREEMENTS]
[RESPONSIBILITY:MEET_WORKERS]
[POSITION:OVERSEER_WARBAND_EXECUTIONER]
[NAME:hired warband executioner:hired warband executioners]
[CONQUERED_SITE]
[REQUIRES_MARKET]
[NUMBER:1]
[RESPONSIBILITY:BUILD_MORALE]
[RESPONSIBILITY:EXECUTIONS]
[EXECUTION_SKILL:AXE]
[APPOINTED_BY:WARBAND_OVERSEER]
[PRECEDENCE:70]
[MENIAL_WORK_EXEMPTION]
[PUNISHMENT_EXEMPTION]
[EXPORTED_IN_LEGENDS]
[DO_NOT_CULL]
[COLOR:7:0:1]
[ACCOUNT_EXEMPT]
[DUTY_BOUND]
[DEMAND_MAX:1]
The idea for the [CONQUERED SITE] additional nobles was to ensure that via the militia policing the conquered site (lets say a dwarf fortress with or without the population replaced with goblins) it could maintain 'order' and stop villainous attacks on the overseer noble and have them punished by death via the "hired executioner" and this actually works very well for maintaining rare conquered sites.
So even if you run off as a adventurer to 'liberate' and assert power over a place that has been conquered or occupied by goblins, you'll still be in hot water for assault at penalty for death (under charges of treason) & if you succeed you'll have your own little personal army on site