+1 Well, sounds wierd at start, but I have to say I like the idee. Aim weapons are always best used at max range for obvious reasons, but having some point blank aimers could be fun, actually you would burst from far away (let's say with pancor) and aim for head closer.
I remember I oneshot someone in reno with a pancor once, around 190 hp in the eyes lol. I like switching between burst and single shot as I used to do it with lsw, this could make shotgun more interesting than a basic rush and burst weapon.
The crit bonus should be 0 at something like half of pistol range, maybe 12 to 15 hex. Below that, each hex shorter should add 1 to crit chance and crit power. If it's crit chance only, then bursting will still be better.
Also, I don't know if the engine allows it, but flechette ammo could have some crit bonus, since it's so weak and useless. It could still have it's crap damage, but +5 crit chance +5 crit power (for trollish crippling/KO purpose
)