Maybe this is old news for some people, but I'm just now finding this tool. Took my collision creation workflow from tedious hours to simple minutes.
This thing is super useful for quickly creating collision boxes for your custom game models.
You just convert the object to editable poly, select the polys that you want to make a collision box around, and it will create a convex hull around that selection of polygons.
You can also make it generate a simple box around the polygon selection.
I've tested it out in joint ops and both the convex and box shapes work as collision boxes beautifully.
https://www.scriptspot.com/3ds-max/scripts/ucx-tool