I use GNU Screen on occasion, and my Emacs keybinding muscle memory is hard to overcome.  I know that I can send a control-a (i.e. go to beginning of line) by hitting c-a a, but I'm wondering if it's possible to remap the keybindings so that c-a c-a so that sends the c-a.  I've tried a simple bind ^a ^a in the .screenrc, but that doesn't seem to do the trick.  I suspect there's some way to do it with the combination of bind and bindkey, but the answer isn't obvious to me. 
Gnu screen: remap c-a c-a to send c-a
command line;gnu screen
You want:escape ^a^aorbind ^a meta(since meta sends the command character, i.e. here ^a).But since ^a is typically more useful than ^z in GNU Screen, you could use ^z as the command character. This is what I do:escape ^z^z