Using an iRiver H140, with H300 LCD/Joystick remote and H100 LCD remote.
I generally use the H300 remote and I just re-introduce the H100 remote for testing.
So I might be introducing issues that were not caused by the button changes.
First off, there is no way to file browse UP a level using the H100 remote. You can't get out of a directory!
Secondly I propose a unified button mapping for all three iRiver remotes on both iRiver HD targets (H1xx, H3xx). The LCD remotes would essentially have 1:1 button mappings from the main unit with the addition of the -10/+10 (a.k.a. bitrate/source) button which could serve as dedicated volume up/down in the event that the UP/DOWN buttons are busy doing something else. (i.e. selecting items)
The non-LCD remote is a bit of a special case and should be constrained to the WPS functions regardless of what view the main unit is in. (IMO) THen again, I don't own one of those particular remotes yet so I have no actual use testing experience with it.
See this thread for more gory details --> http://forums.rockbox.org/index.php?topic=5851.0