Hi there, I have some of my favorites on my WHM...

/ac "Swiftcast" <me>
/ac "Raise" <t>

Really helpful if you have THM leveled to 26 and take swiftcast as a crossclass skill. Its a 1 minute cooldown instant in-combat raise.

/ac "Divine Seal" <me><wait.1>
/ac "Medica II" <me><wait.3>
/ac "Regen" <t>

Useful if you like to proc a divine seal before casting medica 2 followed with a regen on your target. Alternatively swap regen for cure I/cure II.

/p Searing wind on <me>! <se.9><wait.3>
/p Eruption(s) incoming! <se.1>

Very useful during Ifrit EX for alerting the party that you have the Searing Wind debuff, and want a timer on the following eruptions. Usefull for any healer (WHM or SCH).