I'm made this script with some usefull function (for me)
1) in dynamica is impossibile to see ( and modify) initial state (vel and spin) becouse the attribute doesen't apper in channel box and in spred sheet editor
2) i've add a rest world position button, very nice to do it of you have done a frezee trasformation on your geometry, before making a dynamica bullet rigid body
if i'll need more stuff i'll made in the plugin

http://www.creativecrash.com/maya/down ... ullet-tool