So, I was testing the thinking with time machine workshop with a chamber. (I don't solved, because my twim can't hold a cube if I tell her too witouth a cube!), and I see that there is player shadows.

I just think of that because of the sixense first person, where you can see your legs and that short of thing...

So there is any way to add player shadows on your portal 2 workshop map whitouth adding legs?

This is probably because of that extra leg model, that is moved around to match the player motion. You might be able to try sending inputs to !player to EnableDrawInFastReflections, EnableShadows, or AddOutput "disableshadows 0" (whatever keyvalue it actually is). That might enable it, but it could also just not exist. You'd need to be in a projected texture shadow area for it to work, anyway.