Thanks for the tip, GridStatusAurasExt works great and is a lot more configurable than GridStatusMissingBuffs was.
As far as what libbykino posted (and after putting some thought into this while configuring GridStatusAurasExt on my chars), I don't think it's worth checking for Fel Intelligence for a mage, or Commanding Shout/Blood Pact/Qiraji Fortitude(?) on a priest. The reason is that those things may be lost during combat...pets die, warriors forget to re-shout, etc. You should be casting the buffs on everyone before going into combat, even if those other things do happen to be up before combat begins.
edit: on a semi-related note, any chance of an update for GridStatusAFK? Or does anyone know of an alternate way to achieve what GridStatusAFK did?