Disabling envelopes is easy, a couple scripts help with this (by scaling them down to zero). http://www.rpmanager.com/freeTools.htm#skintools http://mitglied.lycos.de/bogi1976/ That last one is just insane... it has nearly a million options. Some great stuff in there.
SkinTools This is a good script for game engines because you can easily select or removing weighting from verts below a certain threshhold. Like clearing out all weighting below .1 for example. You can also select verts assigned to more than n number of bones. Plus some other useful tools. Same creator as the skin…