This version mainly fixes all the bugs I could find in 0.50-pre1, and there were quite a few ! It also puts back the default controls for the win32 version (3 for coin1 and 1 for P1 Start), and it adds some options for the game selection dialog.
Sorry no dialog to change the controls yet, you´ll have to wait for the next update (that´s why it´s still a pre-release : some big features are still missing !). It might be the most stable raine version ever though since it fixes very old bugs that I never wanted to fix until now...