What is the status/eta of this pull request? Unless integration is eminent we'd be willing to offer a bounty to help accelerate it's release. We really need this feature, our current workaround involving multiple bitcoind instances, and relaunch rescan per user session is catastrophically cumbersome.
It will get pulled/released faster if you help test it. Pull the patch, compile a custom bitcoind, then run it and report any bugs. If you don't find any bugs, add a short note either here or in the PULL request.
Testing is currently the bottleneck for getting new features...