I figured the original team is 1x Paladin (Heals) & 4x Death Knights (Damage).
And that I would go with the inverse 4x Ret Pallies (Damage & Heals) & 1x Death Knight (AoE DeathGrip, Ranged Snare, Group Haste, etc).

Then I got the idea of 10-boxing...
With 5x Rets (leveling these now, to join the existing team) + 1x Holy Paladin & 4x Death Knights.

Ten toons is not really an arena team, but this thread is the Ret Bandwagon and not the 5-man arena thread.




You might want a priority build, with Inquisition in it.
And the Inquisition macro is set to fire off once and then hit a null, with a manual reset (say Alt).

That way, you spam away and Inquisition fires up whenever it does.
And it won't fire again, unless your spam key is done with the modifier.
There's not much point in casting a 1-3 Holy Power Inquisition, via random priority mashing... while you still have 22 seconds on the buff.
But once the buff is about to go, if combat persists you would want it up for sure.

You could also put it into a castsequence.
If your priority abilities were Judgement, Crusader Strike and Templar's Verdict (each its own key)...
Your Inquisition could be: /castsequence reset=alt Crusader Strike, Judgement, Templar's Verdict, Inquisition

Meaning...
If your spam key called (A) Judgement, (B) Crusader Strike, (C) Templar's Verdict, and (D) the Inquisition castsequence...
As you spam, you might get A, C, A, D, B, A, C, D, A, B (or whatever).
Until you've had (in order) A > B > C fire off, your D cannot fire off Inquisition.
But if A or D is called first, the Judgement fires and the D macro advances.
Once A or D has fired off, the D macro advances if B or D is called, and once either of those has fired off, it advances again on C or D.

An alternative might be like the Death Knights using Horn of Winter (20 sec cooldown) as a delay.
If you could use a Pally ability with a cooldown that would work too.
/castsequence Fist of Justice (30 sec cooldown ability), Inquisition
That would be one of the spam keys, probably lower priority meaning you'd have Holy Power before it fired off... and it would fire off regularly, shortly after the Fist of Justice cooldown...
Something with a 20-25 second cooldown might be better, if you can find such an ability.