It doesn't hurt to add the Chain Heal sequence to your click dps.
Especially for AV's, as that is basically PvE objectives with PvP along the way.
Just add an extra Click line to your master macro.
Or alternatively, always have the click line, but only put a macro in that slot when you want the passive heals.

For more competitive pvp, especially arena...
You'll want every ability as its own click.
No click castsequences.
Break your dps into 4 or 5 buttons, and try to have similar casting times between toons.
That gives you so much more control over what you're doing and when you're doing it.