One of the things I do for example is with the shaman I add
Code:
/castrandom purge,
to the dps button it'll only go off if there something to purge


another example is with my druid resto specced I add
Code:
/castsequence reset=6 Wild Growth,Tranquility
just tap one every 6 seconds for yer basic aoe heal and double tap for an "oh shit" moment