Akaka's Prop Hunt simply had all "doodads" (really just units) show life bars. It would be fancy if life bars were only shown to some players, but I don't know that that's possible unless you have custom life bars. Anyways, I would focus on adding some new terrains in since akaka already fleshed out the concept a good 5 years ago.
Aside from that, little settings like Doodad Dispersion and the like are great for adding replayability! So if this was my project, I would focus on adding additional terrains and more settings like that. Good luck!
edit: I've given it a low rating for now because it seems to have been released with nigh-unplayable bugs. And maps have not been approved for much less than this. When you put out a new version I can change the rating =)