From our JASS documentation:
Trackables are used to register mouse clicks or hovers at the trackables
position. But their functionality is very limited, as you can’t, for example
distinguish the triggering player out of the box. To get a general overview
to the common workarounds see thetrackabledocumentation.
bug: It is not possible to destroy or modify a trackable once created.
Consider the API unfinished.
The Trackable API was added in ROC Beta v1.20. Unfortunately, it is very limited. There’s no way to
- move trackables around (something like SetUnitX/Y)
- neither is it possible to remove a trackable.
Adding one of the two would provide mapmakers with great flexibility.