I also use the pause key, to stop alts from jumping and/or casting. (Since I have elemental totems on 3 and 4, and I can't get used to writing three and four fullout constantly, the pause key helps save cooldowns. :P ), next to that I disabled the "/" and the enter key (with all modifiers as well.) So my alts only speak if I activate that window with my mouse, then press / or enter key to open chatbox. (This is also to prevent chatboxes undeliberatly opening on my alt chars while going "omg, *spam pause button*, keyclone stopped working! ... ... Oh... chatboxes are open... *headbutts desk*" )

:P