1. Make Hot Shot do a flat Slow debuff. I don't know about the math to set its optimal duration, but it's a little something to help the MT survivability, like BRD does with Nature's Minne and Warden's Paean. It's not something that would break the game, since SCH and SMN already have a 25% Slow uptime with Shadow Flare.
2. Make Overload do Piercing Resistance Down. It could be just for a small duration, like 10s. It would incentive us to use Overload more (besides pre-downtime and during Vulnerability Down), as we would do more damage when the turret is down and it would increase the damage of BRDs and DRGs in our parties, specially in AoE situations.
3. Give Flamethrower a little DoT. It could be something weak that lasts a few seconds. It wouldn't do much of a difference, but come on, we're a debuff focused job, but we we almost don't see negative status icons applied by us on the enemies. And it's a freaking Flamethrower, so it makes sense for the enemies to catch fire.