Collision shapes are always annoying to shape and position. Since the CC3+ geometry is a constant, it should be possible for the software to auto shape and place the collision shapes, or, better yet, generate them based on a reduced polygon version of the character. Also, if I'm dreaming, a more reliable soft cloth collision system would be wonderful too.

I always had problems manipulation collision shapes. They don’t really work. Many times, I try to adjust them, but without any change in results.

My latest movie THE GOLDEN MAN, and a few others: https://www.youtube.com/channel/UCIl1EqVCKitZzLqaNnLK0BA

It is very sad that indespite the evolution IC8 is undergoing but Collision Shape system is still the same as in IC4&5 without change. It is buggy and doesn't give any precise results, even when you spend hours adjusting them, they keep poking through.

Collision Shapes definitely need an overhaul/upgrade!

Toystorylab on Vimeo :     Crassitudes (my "Alter Ego") on Youtube: 

I find the weight maps are a bit of hit and miss method.
Being able to select vertices by painting and applying parameters gives more control where weights are applied to various areas of the mesh.    
VWD cloth and hair plugin for Daz Carra and Poser gives great results
This example has wind affect applied

I wish one day we can do this in iClone, the actual Physics system in IC is far from being reliable in comparison with other software and not stable at all.