Note: I'm only covering Core, APG and UC for feats and traits. I made mention of PSU races but I won't be covering that book any further, as I don't own the book and trolling through the SRD gets annoying fast. If you play a psionic race, I'm sure you can pick out for yourself what's good or not.
I wouldn't until PsiEx is released anyway - The most likely candidate for psionic gunslinging would be a Marksman.
Originally Posted by The Giant
But really, the important lesson here is this: Rather than making assumptions that don't fit with the text and then complaining about the text being wrong, why not just choose different assumptions that DO fit with the text?