[Feature request] reactive spells and abilities

[adrenochrom]

Currently you can only track a cooldown of an ability or spell.
Spells like Revenge ( http://tbc-db.tk/?spell=11600 ) have a cooldown and on top of it they are only useable under special circumstances (Revenge must follow a block, dodge or parry).

Other reactive spells:

• Riposte: http://tbc-db.tk/?spell=41393
• Overpower: http://tbc-db.tk/?spell=37529

Is it possible to add a check for reactive spells and abilities?
The addon "Mik Scrolling Battle Text" shows a notification if Revenge/Overpower is usable. So in general it should be doable.