Long story short, no. Not as far as i know, anyways, though my knowledge is mostly based on INI modding. Maybe one of the sparkle magic Lua wizards here know of a way. Regardless, you'd need some invisible particles to do the punching, since the fist doesn't actually collide with anything.

Not to mention arms/legs don't have properly defined joints, being just animated frames.

The backwards way of making actors strikes again!

I used an AEmitter that fired heavy particles with no sharpness, it sort of worked, you could crush people into the ground and stuff...