I gave this to EFEX when the site was down via Steam, but here it is in case anyone else wants it:
Code:
alias +toggleRight "-moveleft;+moveright"
alias -toggleRight "-moveright;+moveleft"
alias +toggleLeft "-moveright;+moveleft"
alias -toggleLeft "-moveleft;+moveright"
alias +lefty "bind d +toggleRight;+moveleft"
alias -lefty "bind d +righty;-moveleft"
alias +righty "bind a +toggleLeft;+moveright"
alias -righty "bind a +lefty;-moveright"
bind a "+lefty"
bind d "+righty"