revial: Have you tried configuring the user.ini file directly?
BlackJaguar: the user.ini actually doesn't have keyboard config info in the file, looks like it's in Input_QWERTY.ini file but I'm not sure yet how to modify it.
The user.ini file will if you have made any keybind changes via the Launcher. And, for those who are having keybinding issues, I just assume they've already tried to make changes via the launcher.
Otherwise, if you've made no keybinding changes at all via the launcher, you have to edit the ini file named after the keyboard setup as shown in your Launcher options.
To do what the OP wants, he needs to edit those files directly, as he's correct in that the basic Launcher options do not allow those specific keys to be changed.
Yes, far more complicated than it should be, but it is possible. For the OP who thinks it's not.