I don't know about the auto-indent package, I haven't used it.
There isn't a bug with the keyboard shortcuts to my knowledge ... other than the AltGr bug, which doesn't seem to apply to you. You are correct, the following will not work:
I'm not sure if you looked at the document I linked or not, but the correct format and command would be:
The indentation is significant and it must be a hyphen in the keybinding, not a plus.