I was thinking about:
Dual Wielding
Yes, one in each hand, shooting both costs (normal APs + 1/2), but you get a penalty of -50% chance to hit. Also you can't aim just like Fast Shot trait.
I don't know if it can be done, I just think that it would be fun...at least for the one who shoots.
No, better then everyone can use two SG/EW one-handed weapon at a time.
But make perk (not trait) to make less % to hit. And yes you can't do aimed shots when firing with both weapons, and also it considered as burst mode but with 2-bullets burst. And no, not normal AP +1/2. AP for double shot = slowest of both weapons' AP + 1, and for burst +3, you getting -20% to hit (opposite accuracy weapon perk) with first shot and -40% with second. With burst the same + each next bullet from second weapon has double to hit penalty. "One hander" trait will make dual weilding impossible, or -80% to hit with off-hand weapon and no penalty with main hand weapon. But all this suggestions not for this thread ;p
Anyway, why do you want to replace/add traits? Why not to rework existed ones?
Night person = you don't have penalty % to hit and +N to sequence during night, but you suffer -1 ST -1 PE 'cause of day's weakness and eyes' light blindness.
Sex Appeal = when quests will be added, it'll be used,
+ opposite sex has more chance to do critical failure when attacking you, and the same sex more chance for critical attacks. Also NPCs opposite sex consider your CH = 5, if your CH <6, and the same sex CH/2 rounded down.
Edit: Also, continue with Sex Appeal.
If you're in party, every opposite sex player will have penalty to sequence (they will look at you most of time) and the same sex bonus to sequence (they will be nervous).
*If party has more than one Sex Appeal traits, effect do not stack.
*If party has atleast one male and atleast one female with Sex Appeal traits, party has no any effects.