Been having great fun with the mod recently. Edited it a bit to adapt to our playstyle, but still great fun.
However, I was running the new 1.3 beta (no editing) and constantly ran into the FF punishment problem (where you can't enter vehicles).
Only way we could get around it was to respawn, and even then, it never lasted very long. It seems like the zombies receiving the random skins are also still connected to players faction-wise, so killing zombies with skins based on your faction, will not allow you enter the vehicles of others. Or at least, that's what it seems.
Keep up the good work.