A lot has changed since 0.3.1, for the most part, I undershot for what I think was a lot of progress since its release. Since then, there's been a lot of work into the launcher, and now, before I knew it, the launcher is now in a complete and usable state. Make no mistake, however, that this is far from done. I simply just changed the versioning to be more conventional, and there's always room for improvement, so without further ado:
Addon saving and loading! This feature is basic for the moment, but it gets the job done for those that like to have speedometers and HUD mods. You can save and load preset text files for later, too. This new tab may be expanded in the future...
You can now set your name before starting netgames quickly.
Proper downloading of SRB2Kart for Linux distros have been added.
Added a "custom parameter" section to the settings, for those that want to run their own commandline parameters that other settings don't cover.
Text is now shown for the relevant OS
Many more internal improvements thanks to Lonsfor on Github!