What limitations (if any) do you put on yourself when playing DF? Lets face it once you get the hang of things DF isn't really that terribly hard a game, you can wall yourself in and live on your own supplies for nearly forever, the caverns make magma and water plentiful and if done smart with little or no real risk, and a prepared military can usually hold out against a siege unless you are caught off guard.
So.. To make things more 'fun', what do you do? These can either be things you always (or nearly always) do, things you do sometimes or things you are thinking of doing.
Things I do always are:
-I never use drawbridges (aside from the occasional atom smasher for junk). They are impossible for nearly all monsters to get around making your fort nearly impossible to get into for enemies, the only thing I use for doors are doors (duh) and floodgates, that way they are vulnerable to building destroyers, I use walls and things too of course but there is always at least one entrance (my primary entrance, meaning if I want caravans to get in its gotta be at least three wide) to my fort that is only blocked by a door or floodgate. I use bridges too but only retractable.
-I don't use danger rooms, they just work too well with nearly no real risk to them and create super soldiers in no time, takes away too much challenge.
Some things I am considering doing:
-Limit my armor options, like only allow myself to use up to iron, or even copper armor, instead of steel. Or perhaps have a haven/hell option where I can only use leather/bone or adamant armor.
-No cage traps; nothing, to me, is more anticlimactic then seeing the flavor text about a horrific monster of the ages, perhaps a giantess, or cyclopes, only to have it wander into the nearest cage trap and get caught. Normally I'd say I could use them for hunting creatures for food but one could make it even harder by disallowing that as that means no breeding animals you don't start with or buy.
So, what are yours?