I've always advocated for giving Flamethrower the Phantom Flurry (Suzaku Kick skill for BLU) treatment. Shorten the channel to 5s and give it a finishing move tied to the same button, now its more exciting to use. You could go further, make it synergize with Bio Blaster, making it do more damage either by a flat potency increase, or applying a secondary DoT effect, I feel like this change would greatly increase the skill feedback and it wouldn't even be hard to implement.

MCH AoE is a sore spot for the job, making adjustments to Flamethrower and making Wildfire AoE would go a long way, hell Wildfire is already AoE in PvP, the work is already done and it wouldn't even make MCHs AoE overtuned, what's the excuse here? We also get far more battery than we used to with the addition of Excavator, having Bishop Turret back (doesn't even have to be upgraded) would be a nice addition and once again, its already in PvP, work's already done.