In version 01.10.10 the picture viewer is now complete. Also in file manager you'll see mp3/jpg/png files colored - it makes it easier to find supported media. It reminds me of the old days of "4DOS"
Game browsing in all modes is more responsive (excl the cover/slide one).
Covers/thumbnails for AVCHD/Blu-ray compilations created with multiAVCHD are now also displayed.
And in picture viewer you can switch on/off file information with [SELECT] button (just like in the normal XMB viewer) (that's me):
You can't, unless you program it yourself, modifying the source.