I use spaces often enough as passwords, for machines I really don't care, like VMs. Allows to ssh in without changing the config, since accounts without passwords are *not* reachable via ssh without a key.

As for Alt+GR key, "it works here™", with `loadkeys fr`. I can thus use characters like "~" or "#" which are on altgr+2 and altgr+3 on azerty keyboards.
No problem neither for "é" which is "2" on qwerty.