How to force LR to update previews in bulk

hi all,
is there a method or setting to force LR4 to update the prewies in "bulk", means outside of the grid too?
problem is that when applying development changes on image sequences with hundreds of images, or even a smaller bunch of images LR4 only shows the applied changes in the current grid view.
for updating the previews one has to go back and forth in preview by hand. this seems a bit stone age and can take a while.
this was never a problem in bridge, which - although it took its time to create ALL previews - afterwards allowed for quick scrolling trough images with all previews generated. this was especially good for watching stop-motion movies and applying xmp RAW development changes.
for LR4 RC3, this would be a nice option to have... classic, like it is now, and a "force update previews outside grid view" with a true progress indicator / counter, like with bridge.
an example where we started using lightroom during production and ran exactly into the problem of slow / missing preview updates after applying batch XMP / development changes can be seen here (about 32000 raw files processed, 7500 used for the film)
http://www.astronomerswithoutborders.org/news/1066-astronomers-paradise-is-a-journey-for-e veryone.html
or here on NAT GEO
http://newswatch.nationalgeographic.com/2012/02/21/new-time-lapse-gives-rare-glimpse-at-at acamas-starry-nights/
any info or idea would be appreciated. systems used are current Macs with OSX 10.6.8 and Lion 10.4.7.
thanks
chris

hi dorin,
I don't have that. but I found:
lightroom>preferences>file handling>import DNG creation>JPG preview - none, medium, full size (with "embed fast load data", "embed original raw file")
lightroom>preferences>catalog setting> standard preview size/preview quality/automatically discard 1:1 previews...
also "camera raw cache settings" could be interesting? in preferences>file handling
cheers
c

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