Rudi - Keyclone has a round-robin option, which you can set just like do-not-pass. I use it on my shaman for war stomp, key is 7. So I press 7 once and One stomps, press it again and Two stomps, etc etc.

For addons I'd recommend..

Fubar
Fubar Durability Fu (automatic repairing)
GetVendored (vendors greys automatically)
nQuest log (and various libraries associated with it)
Bartender 3
and there was one linked on this forum in a sticky above which was to do with quest accepting/handing in/etc.

You don't need much, and that's pretty much all I use on my 4 slaves.