I think its the same old story, everything sounds simple to do but the way Mach is written everything is intertwined and removing one thing can screw up another. Rev4 is all in modules so changes to one will no affect another and the more people want Brian to do things to fix up Rev 3 the less time he has to dedicate to Rev4 and the longer it will be in coming out.
I have been waiting about a year for Brian to do some work on Turn, specifically dual tool turret offsets and every time he is asked to sort something, which is not a life threatening bug, in Rev 3 my heart sinks as I know the work on Turn will be put back again.
Hood