Allow conversion from PNG to JPG upon import (or later within Lr)
This is nothing new that PNG files are not the best for cataloging photos. A lot of photos today are still being generated as PNG files. Even the iPhone produces a PNG when you take a screenshot for example. Similar to how internal Lr conversion from RAW to DNG takes place, it would be nice to have the ability to convert PNG to JPG. I personally have a backlog of ~2000 PNG's that need archiving and this feature would make such a process immensely simpler.