The only thing gunslinger need is change the ASI bonus for reload speed and other UV in shadowsun.
and really who cares if gunslinger get more damage, thats help the whole party, really im tired of the shiet "kick the gunslinger becouse do crapy damage and only is useless" or "HURR DURR USE SWORDS IS BETTER"
My personal complaint against guns is NOT balance, but fun.
I feel that Handguns need combos. I feel that they need more than one animation for their shots, and that for each consecutive shot there should be a bonus in damage. I feel that there should be fancy footwork and flashy moves, that there should be knockback and maybe multiple shots for certain gun combos.
I don't know about anyone else, but I find shooting the exact same bullets into a crowd over and over again tedious and boring. Imagine if Swords only had the first strike's animation, or if Bombs had - er, nevermind.
The point is, IF guns had combos, the risk factor would be increased, which would mean there would be greater need for reward. More damage, more defense, more resists, no need to reload, and a snazzy visual aesthetic all at the same time.
But that's just me, and I'm sure there are many traditional 'Slingers that would be strongly against any changes made to their gameplay.
Food for thought, I guess.