I think most units are pretty widely used these days, even the nader after the range buff - now he's great vs. base defenses! Splash even kills techs quickly! (Although I disagree with the recent engineer buff. It used to take 4 hits from a grenade splash to kill an engin repairing a base defense, now it takes 7).
Anyway, Fissure aside does anyone consistently use the flamer? I feel every role he can be in is usually overshadowed by another unit, and his slow speed makes him an easy target.
Making him anymore lethal will just be OP on infantry only maps, or eclipse the RPG Trooper vs vehicles or Shockies vs. buildings. He can't be faster too since he was a slow unit in Ra1. Maybe we can:
1. Increase his flame damage, increase reload time, keep DPS constant. Makes him a unit that can really make use of the cover system Volkov style.
2. or Give him more armor, make him a heavily armored but slow infantry. Maybe a bit of an arty/phase counter?