Why not add a Charged-Based weapon that has no flux cost to fire?
Well, for rapid-fire weapons, it would either have to:
1. Recharge at a crazy rate. Kind of gets rid of the "overheat" scenario there.
2. Recharge at a slow rate. So you'd basically get to fire its ammo once (presuming that burst weapons start with full ammo), then "overheat"... then it'd fire veeeeeery sloooooowly.
Instead, I want a weapon that's OK if you fire it in short, controlled bursts, but if you go crazy and fire it for a second or three, it overheats. Like, for example, the Vulcans; it'd be nice to drop their Flux requirements entirely, give them lots of ammo, and give them a fairly serious weakness, vs. Flux-powered PD- they'd quit shooting after a few seconds of continuous fire.
If you want short, controlled bursts why not just have the gun fire in short bursts? I thought that kind of represented heat/loading considerations anyways.
Because I want it to be a user choice, not force-built into the weapon's design. IRL, machineguns aren't usually limited on how long you're allowed to fire them; that's up to the discretion (and desperation) of the end-user.