[REQUEST/QUESTION] Remap system hotkeys for brightness + sleep question

[LawrenceMaceren96]

I recently discovered that X+Up and X+Down can change screen brightness while running GBA roms. This is so useful!

However, I have the GBA B button set to both the 3DS B and X buttons for comfort. Is there a way to remap the screen brightness hotkeys to a less commonly used button combo, like Select+Up/Down? The DSi uses Select+Volume buttons for reference. Maybe a New 3DS can use Select+ZR/ZL. Would be great to have it configurable in config.ini too!

Also, an unrelated question, how is progress on sleep mode? I tested sleep mode in Dr Mario + Puzzle League, and while the game sleeps and can wake with a button combo, the screen doesn't turn off, and I'm not able to lower screen brightness to save a little battery either. Sleep/wake by opening/closing would be great but having this could be a good workaround in the meantime!