I agree with Ether, I don't think a firmware update would increase wattage or ability to fire lower ohms, I think those things are hardware limitations.
Firmware update wishlist:
I would like to see an option to change battery cutoff voltage (like the dicodes dani/pipeline pro)
Better battery management for long run times.
I would like to see it default to lowest or highest power setting for a given resistance instead show e3 and making me go to menu and do it manually.
I'd also like to see a burst mode like Taifun The Eye/dicodes models, where you could get a higher temp for 1 second than backs down to lower setting, getting coils hot faster, burst of flavor than backs down to preserve temp/vape/flavor.... this is a good idea I think, I used to do this with my evic.
Those are just some of the things I think are very doable with a fw upgrade. If a new chip becomes available.... well!
More power, including higher amp limit
At least .5 ohm firable. if not lower.
Repeat: better battery life and selectable cutoff voltage, so you can really drain those cells beyond 3.4v
I'm pretty comfortable with the single button, but I can see others wanting more buttons, that would make us 1 button owners upgrade the control head.