Google Earth and Maps, and to some degree Bing, are quite successful at being platforms people use for maps but having kinetic panning is only one (and probably a minor one at that) of the many reasons for their success.
Developers are a different story as that is a pretty picky audience.
We'll look forward to it in 3.4 (please) with hopes of squeezing it in for 3.3 (double please).
Ideally, it "just feels right" and isn't directly noticed by users
Are people still interested in this? I was able to throw together a rough approach that seems to be working fairly well for me. If anyone is interested let me know, I will probably clean it up and throw up on github in a few weeks. Should work for 3.3 and 3.4.