I'd really love to see a higher quality result from Mosaic textures that weeds out blurry sections of photos, favoring things the most in focus instead, even if it significantly extends the processing time. Not having to go back and try to weed things out and render individual photos to patch things up would easily make it worth it. I'm willing to wait for a higher quality result.
For instance, in textures like this from a recent scan of an english muffin...
...the blurry parts of the texture are coming from a photo I took when focusing on a different part, while the part used in the texture was tilted away. The in-focus parts are coming from sections that were shot straight-on.