General X setting (NOT WM-specific setting) to map keys/mouse buttons?
 

I'm trying out various windows mgrs and I'd love to be able to preserve certain key mappings...
...but what's REALLY important are the MOUSE KEYS!!!!!!!
I use the mouse left-handed. I can set that in Gnome or KDE easily, but if I go into, say Ratpoison, it's un-set again.
Is there a system-wide (or as close to it as possible) mouse setting?

That might seem hypocritical - let me specify that, while I'd like to avoid using the mouse, I would like to use it left-handed when I'm in a WM using a program that requires the use of the mouse.
That is all.