This release of Luma3DS brings many quality-of-life improvements and lays the groundwork for future releases.
First, several settings have been moved from config.ini to unused MCU registers. These settings can now be changed directly through Rosalina and are saved automatically. Some of them are new:
"Enhance top/bottom screen colors" in the Screen Filters menu
Audio routing (automatic, force speakers, force headphones)
Volume slider override and left/right audio balance