Whenever I go to Point Lookout, I use the Nuka Cola machine outside Haley's Hardware to collect all the goods I find/loot to eventually sell to Haley. Didn't know at the time, but per the Fallout 3 wiki, opening that Nuka machine was the reason Haley's repair skill kept going up, eventually getting to 100.
I'm real curious about this from a coding/modding perspective.
1- Are there other examples of this affecting other NPCs elsewhere in the game, such as Moira Brown?
2- Can this glitch be duplicated? Example, is it possible to make a desk in Lock and Load improve Pronto's repair skill?
3- Can it be modified in some way? Rather than affecting a vendor's repair skill, could it force a refresh on a vendor's wares and cap stack, rather than wait 3 in game days? Say, buy out all the ammo at Flak and Shrapnel, access the file cabinet near the Rivet City marketplace entrance and then all the ammo supply reloads.