Just making sure, is the PreEnabled FPS and SPEED by KazUpTV addon allowed in speedruns?

Yes, or at least it says so at the Game Rules, in fact it is the only allowed mod/addon for speedrunning.

Alright, cool

what does it do? and is it allowed in every category?

@1_dude All it does is enable the accelerometer and FPS counter. On boot in automatically executes "fps 1" and "speed 1"