Nerfed into the ground. Combustible gas cylinder has a 16% chance to be triggered (IF freaking talented). IF it actually triggers, it slows its target for 30% for 2 seconds which nobody notices while leaping and force speeding around. Either get rid of it, or fix it for mercenaries. Otherwise, its a waste of two points.
Dunno bout everyone, but if any stealth comes within 10m of me i usually catch a glimpse of them anyway. When i drop Stealth Scan all it does is tell the other team where NOT to step, having very little function other than that. melee and ranged defense by 2%? There is no signifcant change. Its primary and secondary function are useless for PvP and PvE. Utterly useless.
How about changing it entirely to a Pyro version of "Haunted Dreams" from the Inquistor madness tree? I.E: makes concussion missle stun the target for an additional 2 seconds if it is broken early by damage or by CC breaker. Or how about it increases movement speed by 30% when activating Kolto-Over-load for 3 seconds? Or both?
Actually not that bad.
why not make it better by simply making it so we can't be lept/charged to while energy shield is active as well. Defense against roots (which currently seem to be the new hip thing in pvp these days since Roots aren't on the resolve system)
Personally I see Sweltering Heat work quite well, perhaps making it so the target can't sprint or jump when it's on them would help for PvP, but in PvE I find it very very very effective. In PvE a pyro's key to survival is staying mobile and timing there CC with their casted attacks, which isn't usually a practical option in mass PvP anyway. My suggestion is you spend your two points somewhere else if you're a PVPer and you don't think it's effective, I'm sure there's something you could find more helpful to you. Just because it's there doesn't mean you have to use it. But like I said I don't see why a debuff preventing movement enhancements for 2 seconds would be game breaking for the glowbat crowd so I support it.
I would think adding a 2 second damage debuff to targes popped with Infrared Scanners might make it more attractive, pretty much everyone I know just doesn't use it for the same reasons you already pointed out. Your chances of popping someone out of stealth <10 meters and having the reaction time to do anything helpful for yourself is pretty much none anyway. But again, that's two points you can throw into something else.
I don't like your suggestion for Degauss because of Pyro mechanics. Fully talented a pyro can have shields up over half the time in a heavy fight due to the cooldown reduction when taking damage. That's just too much defense against what is a major skill for many profs. I also think adding the previously discussed no movement enhancements debuff on Sweltering Heat would help greatly with the people constantly jumping onto your face issues.
I don't believe making one prof OP just to spite another.
I also believe some talents are primarily intended to enhance PvP while others are intended to enhance PvE. Pick and choose what works best for how you play and go with that, for example I pretty much only PvE now, so I have no need for infrared scanners and thusly didn't waste my points on it.