"Split Drive" Feature request

I would like to be able to easily split drives for better efficiency analysis on highway vs city. My common drive starts with about 25 mins of city driving followed by length highway driving. However, my drive stats for these drives are all screwy because of that initial leg.

If I could easily cut a drive into two by selecting a datapoint in the drive details window, that would be awesome. 

Even better, if the site could auto-detect getting on the highway and auto split (but that sounds complicated).

Lastly, it would be nice if I could view my efficiency at various speed ranges. The software could just take driving legs with different average speeds and group them, similar to how your temp/eff works.

Thanks!