I know it's a bit late for coming up with ideas for traits because as far as we know Bethesda is clearing the way for Skyrim so there will be no new Fallout DLC coming up between NV to 4, but let's come up with a few ideas anyways. Remember, unlike a perk a trait is a double edged sword.

1. Careful Chamberer. You reload slower, but your weapons are less likely to jam.

2. Rapid Reloader. You reload faster, but your weapons are more likely to jam.

3. Haggler. Your prowess at bartering earns you a 10% lower price for goods you buy, but the merchant still needs to make a living so your goods are worth 10% less as well.

Well that's all I have, let's see what you come up with.