Apparently, that's how it's supposed to work.
From the Skin Commands.txt file:
The "SELECT" is working as mentioned, however the "SELECT+" is not."SELECT+" - ADDS the currently selected FOLDER AND SUBFOLDERS to current playlist, "!SELECT+" stay in same screen
"SELECT" - Erases Playlist then loads the current folder and subfolders as the new playlist.
If I am in the root MP3 Folder, and fire the "SELECT+" every folder both in the root, and all sub-folders in each of them is added to the playlist (29,000 Songs). If I go into an artists folder with 3 albums, 20 songs in each album, and fire the select+ commandm with the top album highlighted, I get 60 songs in the playlist.
The Select command on the other hand, will go into the selected folder and add only what is inside of that selected folder.
Pico-ITX / XP Home with EWF-HORM / RR v12/02/2009 / Winamp v5.13 / RRMedia v1.2.2