I've still got my 6500 so I cant comment on SD functions, however here's my suggestions:

Colour code buttons that have a different function if you hold them down for 2 seconds ( e.g. Technicord ). Currently you just have to know about this and the number of users I've met that didnt know you could change things by holding certain buttons down, amazes me.

Better still drop the "hold down" function altogether and make these buttons into 2's. i.e. a large one for function ( e.g. Technichord) on/off and a smaller one right next to it for parameter change.

Provide a "universal macro button" that will duplicate any sequence of button presses / menu selections. The "Custom Panel" sort of does this but not to the degree that it could. Theres still too many button presses for the "Favourites" button to be useful.

Provide the feature that I had on my Yamaha 5700 to permanently re-assign the instruments and settings on the Music Style Arranger mode and have it stored in non-volatile memory. I know you can do this with panel memory but you have to load the settings from Disk / SD every time you play and it is not tied to the style selection.

Provide a screen that would show all of the settings associated with a particular Panel Memory. This would be a pretty full screen, possibly with several pages, but it would be useful when setting the instrument up.

I've played the 7000 and I dont think the chrome buttons are that good especially when you have stage lights reflecting off them into your eyes. The black / Matt bottons on the 6500 are much better in this respect.

Keith