Create client side prefs that extend the service prefs.

vng=r?

I am adding more prefs on the client-side, specifically hardware acceleration.
Will do, we should be locking this codebase down for concurrency -as it grows, more concurrency seems inevitable. And in places with no performance cost, I can't see why not (other than I try to avoid too much of it where 'synchronized' might imply concurrent ops where there is none, and I have found that has confused me on other codebases). I think it is useful in this case.