When there is a marauder built inside of a room it cannot escape as a prank they should thank you and also activate it if you open an exit for it.
Video example of what I mean: https://youtube.com/clip/UgkxG9CPht26xuLV78fcsS6e5iiblgD5OAYu
This would be pretty awesome, yeah, just another of those "take an encounter a step further" type of things... Usually a lot of extra work, but it happens sometimes (just recently I added an extra potential W comment about a "certain bot"...).
(Sorry your post sat in a queue for ages, Theyflower, didn't get notified about the new account block xD)