Area of Effect: Display Markers

[Hulan]

Didn't they say that they wanted to make the game more open to user made add-ons?

I'm sure we'll see this somewhere along the lines even if SE isn't the one making it.

This may or may not be true. Even with a robust add-on API, they may only give us access to the UI layer i.e. no 3D rendering. Still technically possible in that case (as long as we're given relative position information for the targeted enemy, or absolute position information for the player and target), but harder; and impossible to make it look as spiffy. There are too many questions abut the add-on API to know for sure.