1) When using the units buttons to adjust the volume, once
you are in volume mode you can use the down button to switch
between volume,loudness,balance and fader

I've always wanted to do this. It reminds me of the way some Ford radios work. The main menu is rather cluttered with all these options and they could all appear undere a single menu item. The only question is what to call it; "mixer" would seem to be the obvious choice but this may not be understood by non-techie types.

2) Pre set volume levels such as stationary, motorway, and "Parents
in Car" :-)

This is a good idea. I've put it on the wishlist.

3) The option to switch between flat and hierarchial play lists modes

Is the flat playlist mode really that useful if you have the hierarchical mode?

4) Test audio signals for setting things up.

This could be done as a set of mp3s in a special playlist.

--
Mike Crowe
I may not be speaking on behalf of empeg above :-)