Absolute saint from the OutlawsTheGame Discord by the name of Creature made a patched EXE that restores full functionality to the backspace, shift, and capslock keys for text entry (save file name, player name, multiplayer chat).

Have at it boys!

http://outlawsplayers.com/files/olwin_kbd_fix.zip

The site is not available anymore. Still file can be downloaded from the Internet Archive or my own site:

https://tyndomyn.net/files/olwin_kbd_fix.zip
https://web.archive.org/web/20231216120849/http://outlawsplayers.com/files/olwin_kbd_fix.zip

Edit: Copy the URL of the Internet Archive from this message. The link gets broken by the forum software.