It is a huge pain to create a playlist in rockbox.
If I understand correctly, this is the fastest way to do it:
Create a dynamic playlist which automatically adds everything in the folder to the playlist.
Delete the other 9 songs I don't want.
Go through a series of long presses and context menus to add each song to the current playlist
Save the playlist
This whole process takes me 10 minutes for a 20 song playlist. It should take about 20 seconds. Why can't I just use media monkey and import the playlist m3u
edit: I have tried using media monkey to create an .m3u inside the rockbox playlist directory. The oddest thing happens. I open the playlist from my Sansa Clip+ running ROCKbox and the playlist is loaded correctly for about 20ms. Barely enough time to see that there are the right number of tracks in the list and that the first song is correct. Then it goes back to the menu to select a playlist. When I try to hit the home key to return to current playlist, ROCKbox says, "nothing to resume".