The hotkey for WPS and filebrowser could be different although it would be confusing IMO.
I might be completely confused about this (heck, it's happened before :-)), but at the moment there is no hotkey on either screen on these targets is there?
They wouldn't need to be different buttons - it's just allowing one to exist without the other. If you can't have a hotkey on the menu because you need the buttons for the menu itself, I don't see any reason that needs to impact the WPS - just only activate the WPS hotkey. At the moment, 'short down' is a wasted button on the WPS on the Clip for anyone who is happy to use the 'first buttonpress enables backlight only' option as it is intended, and I assume this applies to a fair few players.
Long home looks like a good choice but it is quickscreen already, perhaps we could use this key and make quickscreen a hotkey option?
That also could work, though I'd be surprised if there were many people who would find a hotkey more useful than the quickscreen, as the quicksreen seems a bit like a 'meta-hotkey'. I'm sure they exist though...
EDIT:
The more I think about it, the more it seems that 'back to main menu' on the home button is the weak link. If I ruled the world, short power would be 'back to main menu', left would be 'back', short home would be 'quickscreen', and long home would be 'hotkey'.
I can't think of anything you could actually get 'stuck' in without separate 'left' and 'back' keys, but maybe I'm wrong.
That make more sense to anyone else?