Point i'm making mate, is that the whole software/development process is anchored deep within a plethora of other management issues, decisions etc. So how easy things are from a software viewpoint really has very little relevance sadly.
And don't forget that the chips that go into these units are Roland custom designed as far as i'm aware, so you could presume that workflow/interface changes are higher level, but i'm wiling to bet their chip development is quite old school and done predominately by hand using basic, but hugely efficient tools.
I think your idea is great in terms of a paid upgrade, and it would give a company like Roland some incentive, i would happily pay if it offered some good improvements. Otherwise, these updates aren't going to happen i expect (like most).
Unless, they believe the FA would see a boost in sales (i.e. the V2 Sampling update that the Juno G had - it had new stickers on the units in stores, sat next to the M50 etc.) I just don't see the FA needing anything major that would justify the expense and would be immediately saleable. Perhaps non-linear/grid based sequencing? But really, is that a big pull with the majority using computer workstations now.
On the flip side 'if' a paid update was to happen, how an earth would they manage it? At the end of the day it's just a bios file, there's no protection on that file that, i don't know if they can protect the bios update so it only works on your serial numbered unit, for example.
So, to enforce that would require some kind of security check, a system of registered users requesting custom files with their serials embedded securely etc. or else the file would just be taken by freeloaders, many of which would justify it as believing that the update should be free.
Personally, i think a better way forward would be for Roland to have some true representatives on boards like this and engage where they can with users, not for small fixes and day-to-day use as the community can help with that, but on higher level subjects like this, and serious requests for improvements. Even if it was just a month.
The biggest issue, for me as a customer, is not knowing if you will ever see support in the future. I always presume the worse with Roland, so i expect no updates to the FA, and expect the USB Midi/Audio driver to lose support in the very near future - luckily, the FA has a generic USB Midi mode, but that does mean Audio will go at some point.
I hope they prove me wrong, but history shows not.
I will say one more thing on this also, i got my FA after watching videos like this:-
https://youtu.be/op2XlVV__fE?t=990
Notice at 16:30, Gareth, the guy from Roland specifically says that the blanks for the pad modes can be filled with 'whatever' he wants, as it's *just* software, or at least that's what the experts tell him in Japan. And it's hugely intimated that updates will be free flowing because of the *just* software statement.
...yet no update, and no follow up from any Roland representatives on the subject either. :(
It would be areas like that where some of your ideas would be implemented too, as it would be most logical to put on the pads.