Servers are down and I'm bored, so I'd do something like this:

Rogue
Key 1: <empty>
Key 2: /cast Sinister Strike
Key 3: /cast Eviscerate
Key 4: <empty>
Key 5: <empty>
[align=left]
Priest
[/align]Key 1: /follow rogue
Key 2: /assist Rogue
/castsequence Shadow Word: Pain ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Key 3: /assist Rogue
/cast Shadow Word: Death (When you get it)
Key 4: /castsequence [target=Rogue] Power Word: Shield, Renew
Key 5: /cast [target=Rogue] Heal (or whatever heal you want)


This way you can spam 2 and the rogue will SS and the priest will cast SW:P once (Unless you spam the button too much). 3 for your finishing move, hit 4 twice to shield and HoT your rogue and 5 to heal him