With InnerSpace you can set the client files to use different ones files, so you don't need to install EQ multiple times. I've got 6 different key bindings for my 6 different accounts. You definitely want to follow Brohg's advice about multi-binding your keys, broadcasting those keys to all your accounts and spamming them. EQ is very friendly to this approach for all classes except necros. With inner space your goal should be to minimally switch to different EQ clients.