Now a days mercenaries and assassins don't buy registered guns because of the police I suppose,(I don't speak from experience either wink wink) so in the world of fallout I don't see this as big a problem.
Anyway, if it's possible then I agree 85% does sound good, but I'd like it to effect all weapons and armor in the game if possible(in all shops).
By the way last time I played I made a simple mod with a recipe to convert 10 cap for 90 caps that was a quick fix, so if this mod is to hard to make I could simply remake that mod.(then any time I completed a quest or mission I just multiplied that amount of caps at the near workbench).
of course since I like to role play I also add a bit of weight to caps 0.01 and I use PN to lower my carry weight to a reasonable sum. So it would be nice to carry less weight to go to the stores.
anyhow I really enjoy playing this style it's a lot faster then to check every corpse or an entire building for all the things with a high value/weight ratio, so I recommend this for other people who want to play TTW in a different manner then what they used to.
Thank you for the very quick response Thatchor.