LOL made me laugh hard Jynx.
This isn't exactly trivial. For example, when playing as a pugilist, there are a number of abilities that can only be used after you evade an attack. Due to the quickness of the combat text, you literally have to glue your eyes to your character if you want to catch it, as there are simply no other cues to let you know that this has occurred.
We don't need bright neon color signs (though I admit I liked them in LotRO), an extra visual cue to let us know this has happened and that such abilities are now available for use would be extremely helpful.
I like this idea. Dreamer brings up a great point about the ability's that can only be used after a certain action has occured. Having it highlight if an ability is ready to use would be nice.
personaly I would hold off till the battle and classes get fixed. We don't know what going to change, but they might change these abilities. If they are that hard to time, they should at least.