I see no urgent firmware requirement. Users would then over-use the front panel to select a pseudo-setback temp (leaving only 2 valid presets). Economy-minded minimalist's can drum-up an external set-back without voiding a warranty, and operating an up-scale soldering station might imply our ability to create, right?
Potato patato.. only thing i can think of off hand that might be an issue metallurgicly would be if someone rapid cycled the transition states a lot but who in their right mind is going to do that? As long as one of their initial set points didnt go under 380 that would avoid most folk off hand doing it unless someone went out of their way to drop under and going into program mode.
Other wise its a programmable preset.. leave the users to set what they want and use the tool as best for them
Edit: Actually I just had another idea that could even counter that.. the firmware is obviously update-able by them.. they could throw a rule in if someone drops down to that low preset, the cool down time doesnt start till the same time as the isb or what is safe to block rapid cycling
Edit 2: Another might be to do the rule but ramp down fast and then slow down/stop at the former 380.. , hold till a set timer is cleared then go down to 350... and really dont need the rules to work unless someone has already lowered it down once to 350 then went back up to say 650 for a quick joint and dropped back down again