MCH Overheat should activate automatically

[Shurrikhan]

So removing any button bloating and streamlining the burst would be something like this:

Overheat starter and Heatblast can be on the same button, but the finisher needs to be on a separate button in the case you want to finish it early.

This. Turn Heat Blast into the finisher, too, on last charge, just for accessibility reasons, but also have the finisher as a separate button for early Overheated consumption.

The dot is fluff at best.

I don't think a DoT is problematic, but generally the earlier, the better. The idea of a finisher is generally that it ought to... finish, as would befit finishing something off.

It'd make more sense to have the DoT on the opener instead.