Spell Activation Overlays work well in conjunction with button glows.

The goal is to make buttons "glow" for actions that are empowered by the SAO:

• for example, Mage's Hot Streak would make the Pyroblast button glow

This may look weird when too many actions are empowered:

• Mage's Fingers of Frost makes the next spell cast as if the target was frozen
• this means pretty much every frost spell becomes empowered

The main difficulty would be to be able to attach the glow effect to existing buttons:

• unlike SAOs which are graphical elements created by the addon, buttons already exist
• is it possible to attach a glowing effect on top of existing buttons?
• is it efficient to "find" the correct button to add the glow effect to?
• (Blizzard didn't have this problem in Cata's SAOs because they control button frames)
• also, would this work with addons that create buttons (ElvUI, Bartender, etc.)?

This is a rather huge topic, so it may be added very late, or maybe even in another addon.

Functionality implemented in #43 and greatly improved in #44.

The ticket is kept open because it has been reported that ElvUI buttons do not display the glowing effect. At the very least, ElvUI and Bartender (not tested yet) should be supported.