WTF. So many keys. I hardly ever use even key 5. 6? Nah, never.
My layout is dependent on the situation, except planes, in which:
1. - Vamps + Avengers (as fighters)
2. - Avengers (as scouts)
3. - Bombers (Ravens + Pphoenixes)
4. - Licho.
There is also one main rule - number 4. is always mobile AA, no matter what (when happens that I have both Licho and mobile AA, I put licho on 3).
Everything else is being changed flexibly.
I.e. when I need to have riots separated from assualts and raiders I put them on separate buttons (via ALT + number). When Im creating one huge force, to push through one point I simply put eveyrhting on 1 (via ALT). When Im trying to direct 3 attacks at different points at once, or at one point from different dirrections I use all 1 2 and 3 buttons (with CTRL).
Flexibility - thats all u need. For me buttons starting from 6 are simply too far away.
P.S.
I never put Skirmishers alone, as they die too quickly, tahts why I need only 3 buttons, not 4.