I was half drunk when i wrote this. I don't know what im saying either.

Maybe the arms can flail when buildings get sapped?

Headgear slot?

Perhaps the jigglebones could be attached to the engineers model, so when the engineers hand moves, for example while swinging his wrench, the robot does a little jump, arms flailing and rapid shaking (like when you shoot them in the gamemode), and by much more simplistic movement, like shooting, just the arms move. This also means the robot starts to dance along when taunting, but the entire idea requires a lot of work to implement, since all the movements have to be tested so that there aren't any weird or impossible movements happening, like what ahppens when you shoot someone with a huntsman.