Posted May 18, 2012 9:08 UTC (Fri) by jamesh (guest, #1159)
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Presumably it would be a loopback FAT32 file system stored on the flash, which the phone would have to unmount when switching on mass storage mode.
While MTP might be a little more cumbersome to use, it does have the benefit that both the phone and your desktop can access the file system concurrently. That seems like reason enough to concentrate on making the MTP user experience as good as possible rather than trying to hack UMS support back in.