AKA more perks, traits, expanded SPECIAL purpose (for example agility helps you reload faster in New Vegas) and perhaps the crafting recipes or some of the guns from New Vegas?

Not trying to start a FO3-NV war but some features of New Vegas are simply improved, and it'd be nice to have those features in both games.

I was never able to find anything that gave me that New Vegas 'feel' so I was forced to give up that pursuit.

I chose RI - Primary Needs (which includes an injury and healing system that you'll want to tweak on your own if you know how to mod), FOOK2, and (I think it's called) RH Iron Sights. That was a pretty good experience. The Realistic Injuries mod was a game changer all by itself.

I don't think there are any mods that change reload speed and I never did like what anybody did with perk overhauls.