Thanks for your image, that make sense for your requirement.
I double check our API, it looks we don't have workaround to implement that by our currently API.
If you want to implement that, you should want to write your customTrackInteractiveOverlay, override the functions: MouseMoveCore, MouseUpCore and MouseDownCore etc.
Because for post support it's complex and we don't have existing sample for it, I think maybe you can refer our TrackOverlay sample here: https://github.com/ThinkGeo?utf8=%E2%9C%93&q=track&type=&language=
Wish that's helpful.