Would a Map Analytics Tool be Useful?

I'm trying to figure out if this is a good idea:

A program that shows where things are happening on a map (eg. kills, sticky traps, übers). It would also highlight sniper sightlines and potential perchpoints, among other useful things. You could filter info by class, time, payload progress, etc.

The idea would be to give mappers a clear look at the data that playtesting has generated in order to aid in the design process.

I think the idea is interesting, but I don't really want to spend a lot of time on something useless.
Would you use this tool?

A good benchmark question then, is:
Do you find Heatmaps.tf useful?
(and why?)

It definitely seems like there's a place for such a tool, but does it sound like something you would actually use?