Media Library - How about an "Is VBR" conditional?

[blackwind]

Problem: I'm trying to replace all my low quality music. To do so, I first need to identify which files need replacing. When I create a Smart View to display files less than 160kbps, a large number of low-complexity VBR songs are being caught in the mix -- particularly ones with hidden bonus tracks preceded by several minutes of silence. Obviously, this isn't what I want.

Solution: I propose an "Is VBR" conditional similar to "Is video". Filtering by "Bitrate (KBPS) Is Below 160" and "Is VBR Equals 0" would give me exactly what I need.

Yes, I assume there are other applications I could use for this purpose, but I want to use Winamp.

Thoughts?