I have an idea for a buffdisplay addon but I don't know if its even possible.
1. Just the normal stuff: scaleable, different timer options, temp.weapon enchants alone/merged with buffs (when merged always at first), button facade support, etc
2. blacklist to hide buffs you don't want to see (caster related buffs for warriors etc) with different sets already saved (melee/ranged, caster, healer, tank) with the option to add additional buffs to your blacklist or remove them.
3. an additional frame where you can show up to 5 buffs you want to know when active (Shield Wall, Avenging Wrath, etc) (maybe use another addon for this)
4. and here the thing I don't know if its possible: Different settings for Primary and Secondary Talents. For example: Paladin with Holy 1st and Ret 2nd specc, when in Holyspecc hide all melee relevant buffs and when in Retspecc hide the caststuff
I know that I can 1.-3. with SatrinaBuffFrame, but the 4. point is the most important