Locking songs in playlist

[Draxxis]

Is there a way to lock songs, within the playlist, so when you do the "randomize list" option, that those songs stay in the position and don't get moved around?

What I like to do is make up a playlist of songs, then move all of the slow songs to the bottom of the list.. Then I would like to randomize the rest of the songs.. That way I can move the slow songs up at a later time by unlocking those songs.

Is there a way to do this within WinAmp, or do I pretty much have to add the slow songs in after randomizing the list?