The bends need a bit of smooth morph brush when arms are way up or legs are posed 90 degree sideside or such, and the morph to k4 is dialed strongly.

However, one can trick the program and use it to morph k4 to m4, and I think, then there should be almost no near-k4 issues.

So far I didnt receive any hate mail for bad bending (but also not many product reviews either ;)  I just wanted to point out that there are limits. But I think with a bit of smoothing its good.

If you like, I can send you the program shareware-like and you can decide if its good enough or not.