The only one I really care about from those is an improved Vintage knob... pref one that doesn't detune/go out of tune so much toward '1'... but would still retain the env and other looseness.. i.e make it actually usable!
I think the other stuff is starting to take the Prophet away from one of it's main plus-points... focus!
What I *have* felt would be great yet streamlined additions are:
1. Reverse Saw for the LFO - By holding down the current SAW button until it flashes (or to bring up a menu on the screen to select 'norm' or 'rev'). Absolutely simple and clean to implement and yet massively potent for all kinds of sounds. Reverse SAW is one of my favourite things to add to a filter for that rhytmic boink boink sound... sounds great on the OB-6 but would sound awesome on a Prophet 5/10. I'd prefer the long press instead of the menu... and the light could flash or pulse on the LFO waveform to show its in reverse mode. You could do the same for the other 2 but there it would be polarity.
2. LFO SYNC!!! come on it's 2022.. we don't always wanna hook up midi to the DAW and send CC.. a simple switch or option to enable sync to incoming clock/tempo.... could access this by holding down any of the LFO wave buttons for say 5 seconds and then it flashes to the incoming BPM. For subdivisions you could step through them using thee usual group/bank to show the 4/8/16/d/t etc while holding down all three lfo wave buttons while in LFO sync mode.
These 2 additions would push the amazing Prophet 10 upto a new level and yet retain the simplicity and ease of use.
Many other options get a bit hacky sounding, like third party mod upgrades. I think the LFO 'fixes' or 'uprgades' would be relatively simple to get in, bug free, vs adding tons of new features.
The only other real complaint is the 200 user banks vs 500 on the OB-6, even if we could sshift select another hidden 200 storage I'm guessing the memory doesn't exist on the mainboard to do so.. that ship has sailed I guess.
EDIT: I forgot also... I think an LFO that can go twice as fast 'hi rate' would be cool, so again we could just hold down one of the LFO buttons (or all 3) and select 'norm' or 'hi' to switch the LFO to be much faster, inline with more modern synths...