In Facial Stuff, they add hands with proper positioning of weapons so that they appear to be held by the pawns. Modded weapons don't come with repositioning, unless the author adds them. Does your mod have this?

I've tried the in-game weapon positioning editor myself, but can't seem to get any positive results. The author of Facial Stuff wouldn't address how to use the editor nor was he willing to add a generic weapon position for the sake of unadjusted mod weapons. In other words, I'd have been glad to do it, but I can't seem to wrap my head around the editor.