Nice to hear from you,
I'm not sure what this props menu is, whether it is part of your importer or MAX, I'm more a Cinema4D person, but are you saying you cannot use the biped?
Because the way the joints work is such as blessing compared to h1vltg3s rig. Half of the time I select the damn helpers and not the bone.
Using the name list is slow work so I just deleted the dummy so I can get the actual bones selected.
Bob Lester tells JulioNIB tells me that you can you the biped by exporting the fbx and them importing ontop of h1vltg3s rig. looks like it would work (Let's me export the anim) but then it is a static default pose in OpenIV.