Re: Complicated escape (or two escapes) or some other answer.

> mod2        Num_Lock (0x4d)
>
> I didn't know Num_Lock could be a modifier...

It can't. It's a hack so that X programs don't read num_lock as a
regular key. Or maybe its some XKB thing. In any case you won't be
able to use that key as a modifier in ratpoison. A possibility would
be to map the keycode generated by the physical key to a different
keysym like Hyper and stick that on mod2 (moving num_lock to an empty
MOD). I'll leave the key juggling up to you :).

-Shawn