Apology for multiple posts due to Mozilla bug

[Bruce Ingalls]

I should have used gnus.
Mozilla complained about my spam blocked return address, and implied 
that the post did not go thru.

Back on topic:
Has anyone tried to write keybinding themes for EMacs, so that I could 
just go to Customize, and choose

o Native
o CUA
o vi
o Gnome
etc.

Is this even feasible?