Apologies, should have explained better in the controls, the longer you hold the mouse click the more powerful the explosion becomes.
we are aware of the collision issues. unity doesn't play nicely with ragdoll but Matthew is hard at work resolving these issues.
as for jumping i don't reacall why it wasn't implimented, most likely it was another ragdoll issue but I'll bring that up as something to be added. Thanks for the feedback -Sam