I am still failing to see how the Gunslinger perk will be useful in KF. So I'll start it out like this.
Killing Floor is a co-op game, where the players must help each other to survive. There are 7 perks, each with different characteristics and some perks are almost opposites of each other. This is done to encourage teamwork.
Now what I can gather from the posts I have read, the Gunslinger perk is a versatile, pistol wielding, ZED-Time based perk. I have a problem with the "versatile" part. Your idea of versatile is having the perk decent against all enemies but having it outshined by other perks if a certain enemy is their primary role.
I want to say this. Versatility in KF is a big NO-NO! Versatility won't encourage teamwork, it will destroy it! Because the Gunslinger perk seems to be able to take on any kind of enemy, there doesn't seem to be an obstacle that the Gunslinger can't overcome! Everyone will want to play as Gunslinger because of this! No one will want to play any of the other perks anymore. Diversity will disappear! Think of it this way. A team of 6 Commandos will be crushed by Fleshpounds and Scrakes. A team of 6 Support Specialists will get mauled by crawlers. But what's going to defeat a team of 6 Gunslingers? They are decent enough to take on any kind of enemy! Are you guys seeing what this perk is going to do to KF!? Please people, open your eyes! The Gunslinger still needs a weakness!