Buttons:

M
Play
Arrows
Slide Up
Slide Down
Select (tap centre of scroll pad)


Screens:

Lists
WPS
Context Menu
Quickscreen


General:

Off - very long play


Lists:

Select - Select
Back - Arrows
Up/Down - Scroll
Context Menu - long select
To WPS - Play
Stop - long play
Menu - M
Quickscreen - long M


WPS:

Play/pause - play
Stop - long play
menu - M
switch seek/skip direction - long M
To browser/databse - select 
long select - context menu
vol up/down - scroll
skip - arrows
seek - long arrows


Context menu:

select - select
back - arrows
up/down - scroll


Quick menu:

Change file view - up down
For repeat/shuffle - do we have them?
If so:
cycle through repeat - play
cycle through shuffle - M
quit - arrows