I replied in the Isboxer thread too. I do it with just 2 Follow macros and 2 Assist macros. That method supports up to 14 characters. With 3+3 macros, you could support up to 21 characters.
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I got it working via the method Alge suggested. It works fine, but my i5 2500k doesn't have hyperthreading and my CPU bogs down too much. So I just moved the second group to my laptop and they are all on low render with the lead window @60fps in most non uber congested areas.