We also had to find out about all these, on our own.
It’s a good way of resolving the issue, using Line Trace to detect the Floor.
For our purpose we’ll need the Complex Collision to simply work, as that’s the only way of having an accurate Cloth Simulation for the whole Character, is not just about a Cape or a Jacket.
Seems that we’ll have to find the solution on our own, but would be great if the Engine supports that, by default.