'Maximum' Quality Setting for Previews

Dear Adobe,
Aside from 'Low', 'Medium', and 'High' settings for standard-size previews, please add a 'Maximum' quality setting (equivalent to 10-12 quality setting for JPEGs in Photoshop).
As standard previews are generated for imported images or for new edits on images already in Lightroom, sometimes low quality JPEG previews are generated. These previews exhibit color banding & macroblocking artifacts typical of JPEG files (especially in dark areas). Since these previews are used in the Library, Slideshow, Print, and Web modules, it's pretty darn annoying & distracting to stare at low-quality renditions of our images. Switch to Develop module, and a fresh new image is rendered on screen; therefore, these JPEG preview artifacts are not visible in the 'Develop' module.
Two fixes to this problem:
1.) Add a 'Maximum' quality setting for previews that Lightroom generates
2.) Fix it the Aperture, Bridge, iPhoto, 'every-other-software', and your own 'Develop' module way: display the precached preview first, while rending a fresh view of the image in the background... display that when it's ready.
Here's a forum where I've discussed this previously:
http://www.adobeforums.com/cgi-bin/webx?128@@.3bc33a73
Here are examples of the low-quality previews generated by Lightroom (when 1680 'High' setting is used for previews):
http://web.mac.com/rishisanyal/iWeb/Homepage/Macroblocking.jpg
http://web.mac.com/rishisanyal/iWeb/Homepage/Library.jpg
http://web.mac.com/rishisanyal/iWeb/Homepage/Library_vs_Develop.jpg
And if you are using a well calibrated monitor, then look at the macroblocking in the black wool coat in this image (please use a color managed viewer, else the coat will just look black and you won't see the blocking):
http://web.mac.com/rishisanyal/iWeb/Homepage/Lightroom_JPEGblocking.jpg
We photographers have discerning eyes. It's painful to see this terrible renditions of our precious images... and to have to switch over to the 'Develop' module *just* to get a high-quality rendition of our image? And meanwhile watch slideshows with low-quality versions (previews) of our images?
Sounds pretty unacceptable to me.

So, I'm pretty much convinced now that the problem with low-quality LR previews seems to be mostly isolated to the previews that LR generates after you make edits in the 'Develop' module.
Upon first import, this image looked fine in the 'Library' & 'Slideshow' modules. After making some edits (color, tone, etc.) in the 'Develop' module, I ended up getting this hideous preview in the 'Library' & 'Slideshow' modules:
http://web.mac.com/rishisanyal/Lightroom/07-0310_BandingBlocking.jpg
You people with LCDs will be able to see the JPEG artifacts better than those with CRTs, since LCDs tend to be sharper.
So, the obvious question is this:
Does LR, when *re-generating* previews for edited images, ignore the quality-setting for JPEG previews (which I have set to 'high')??

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