hm. for me it isn´t working. and I did like U said. no expression, just added a boolean attribute on the joint and set it to 1. even if it´s turned off, the rotation is locked. I couldn´t even tell where to look for salvation. Hypergraph has no information - maybe the Graph Editor would be the place to go, but I´m not very familiar with it yet.
don´t waste your time anymore friend. there will be a solution some day. I´m just not that far to have a global understanding of maya. thank you though valdimir!
thx for the link Jango, bookmarked it! his site is very informative. but I guess I´m missing some very basic context here. I´ll go on with painting weights and setting influence objects and have a look at SDK again soon, cause right now I feel like reaching deadlock.
kind regards!
everything starts and ends in the right place at the right time.