Creating a concave collision out of convex chunks, some of the vertices are in the same position and on export they merge. Does anyone know how to deal with this?

revert back to 4.0

Is there a way to somehow control the exported bone ids? I need to keep ValveBiped.Bip01_Head1 under the id of 6, but ValveBiped.Bip01_R_Calf is in its place instead, replacing the ids manually is inefficient, because i need to do it for like 10 different bodygroups and every single one has 30k+ lines of data, its too inefficient. I tried optimizing the process with a python script but i couldn't do it properly. Maybe someone has a solution to it