Was messing around with the impactjs engine earlier today with their editor. The tile editor is a disaster. I couldn’t even load 125x125 32x32 tiles without it lagging hardcore. I instantly went back to the tiled map editor. 
One thing I think we could take away from their editor though which is the only thing that makes it worth-wild is a feature called linking objects.
For example:
Basically if a properties’s value matches another object, a line is drawn connecting them.
This would help tremendously with creating interactive maps. Ofcourse, you, as the tiled developer only needs to implement and draw the line. We as the game programmer will utilize the linking objects in our own way. I think this is a serious, and awesome idea to further enhance tiled!