Weird. I just dual-spec'd into Ret for PvP.

Anyway, this works for me... and works well:

Code:
#show Crusader Strike
/startattack
/stopcasting
/castrandom Judgement of Justice, Crusader Strike, Divine Storm, Hammer of Wrath, Cleanse, Flash of Light
The /stopcasting will halt the FoL if it tries to cast while standing still, but otherwise you're running around like a retard in PvP so it auto-cancels. This will also pop cleanse, which is critical for getting nasty spells off of you.

You would think that FoL'ing so much would drain mana, but glyph out Seal of Blood and you'll get tons of mana back through that. I have no mana problems at all spamming this.

Also, automatic HoWs, without worrying that they are < 20%, are really fun.