Q:
Thief D/D and Pistol/none problem
A:
There’s no way to change this. If you’re trying to get the Pistol weaponless 3 skill it’s actually just a Pistol/Pistol 3 skill but 60% as effective for the full cost (of initiative).
Yeah, this bugs me as well, it just means that we can’t actually use all our weapon combinations as all empty weapon spots are filled in with the other weapon set ones.