Bug Fixes:

• Every Player & Tag has a Default UI Binding
  • This should make "Reset to Default" fix any messed up UI controls
    
• UI (Menu) controls can no longer be rebound.
  
• The location that custom controls are saved in has been moved.
  • Loading up this patch will effectively nuke all custom controls, fixing any UI bindings that got mangled last patch.
    
• You can now assign the same button to multiple different actions.
  • Enables tap jump.
    
  • Will no longer unbind UI buttons when trying to rebind A, for example.
    
• Various UI/text fixes
  
• Added a binding for "unknown controllers" that should improve compatability.
  

Other:

• Added a button to the rebinding menu that allows you to add a controller without leaving that menu.
  

I haven't worked on fixing gamecube controllers specifically but that is my next task. IIRC they work fine except for the rebinding screen.