Well your assumption relies on Dwarf Fortress always being an incredibly easy game that has absolutely no challenge.
The undesirable effect is a mechanic that destroys that difficulty.
An "Easy out button". Which is there if the player wants it, but with this he has a way that it isn't an Easy Out button.
Which is needed because the easy out button is actually a feature and is an easy out inadvertingly.
Simple... Play that Kobold leader.
Do you even have that option?
I mean, isn't it "cheating" already if you can just start declaring yourself king of an already-established civilization, rather than starting as a random shmuck from nowhere? At that point, why not take the "easy-out" button and just declare yourself the baron of an already-built fort?
(Or the already-extant "easy-out" buttons of modding, save-scumming, or memory hacking that seem to be far less trouble to actually pull off...)
Besides which, I hardly see how this whole idea of yours is even
feasible as a means of cheating.
I mean, are you honestly expecting Toady to just give over to people mechanics that let them "Assume Command" over the goblin general just at the point where they are breaking down your fortress's gates, order the goblins to turn around, and then switch back to fortress mode again, all within the space of a few game ticks, or something?
For that matter, are you expecting Toady to let you just start body-snatching any random historical figure you want, whenever you want?
Because it seems like this whole suggestion boils down to suggesting Toady not do something he would never in his right mind do in the first place...