The way the motion is set up here, none of the servos fight each other, so there is no problem with 'binding up' when combining certian motions.
The problem of the rotate tab coming loose is also addressed here as well as the possibility of rotating too far in either direction.
http://www.youtube.com/watch?v=TIjkcSjkDek
Please look for the release of this and more information on graveyardskulls.com in the coming months.
Remember that this is just the prototype. Improvements have already been made, and the final version will look a bit different, but the concept is the same.
Here are some pics:



