Sure, but, if you just let the Folder be the VCA master, the children will be doubly attenuated by the fader.
You can just simply bus the Folder output PRE-fader to some other sub bus.
This, of course, can effect any dynamic effects on the Folder itself - but this is the case with VCA's anyway.
If you want to have your cake (ease of VCA) and eat it too (slamming the Folder comp) you can set up some esoteric routing scheme. See here
http://forum.cockos.com/showthread.php?t=121104
Or another option, .... well I'll make an .rpp to explain..