I do that very thing because I'm broadcasting to 4 instances and still want to be able to single control them if need be (chat, etc.)

I don't know you're entire situation so the applicability here may be limited. What I have that you're missing is Autohotkey. I use that to intercept the special character (SC134:: for example) and then send the command I want to the wowid I want. So, for instance, SC134 which is like å gets caught and then sends a ALT+1 to wowid 1, etc. Even if you've only got one account on that machine you could do the same thing if wow doesn't catch the special keys.

Hope this helps.