Hi there, I have an iriver h120 running rockbox and I love it, but I just thought of one cool feature that I would love to have: on demand light.
I found that the backlight on the player drains a significant amount of battery, particular on things like volume adjustments where you don't even actually need the light, so I completely disabled it.
I have found that 90% of the time you really don't need a backlight anyways. But for that 10% of the time you do need it, it would be nice to have a re-purposed button that could turn on the backlight for whatever your current backlight settings are.
For example, you could use the already present "hotkey" function and just add a setting for backlight, so the record button would just turn the light on.
I could be wrong, but I don't think this would be that difficult to code (I know, easy to say when I'm not the one coding it!)