Just one simple report, 4-5 hours work... reported was that selecting in action+nla window is slightly off. Quite annoying. It appeared to be a wrong usage of View2D facilities, causing part rewrite of a lot of stuff here. Mainly did it as excercise, to get better understanding of all of this. Would need some testing though! PLus; fixed crash while using "single user" menu with Ipos in Object.