Keyhole is useless if you are running a Combustion build but it is not as situational as you think since most PvP maps are close quarters. Lots of opportunities for a patient Gunslinger to fire into a chokepoint and take out multiple players rolling covering each other but running either single file or in a very tight formation.
Also good for taking out multiple players lollygagging at a capture zone or camping the HW spawn.
English
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It I'd still way to situational for me to take over Scavenger
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Eh, you don't run over enough dropped ammo in PvP to get the best mileage out of Scavenger, IMO, which is why I prefer GT. Diff'rent strokes though. If you make it work, then good on ya. Continue to build against cookie cutter conventional wisdom.