Midi Logical Editor - Randomize CC value

Hmm, my goal is to create a series of small random fluctuations of the value of CC21 over the time period of a track. Could I use the Logical Editor for this or would I have to fake it by manually Paint it in a Key Editor controller lane?

Also, anybody know if there is a user library somewhere of Logical Editor presets or controller lane presets that others can download?