Hi. I just added my vote for this feature, and wanted to point out that CD Wave (cdwave.com) provides a very nice implementation of this.
It allows you to select the tracks you'd like to export from a list of all tracks. Once selected you simply do a "save as" and it exports the selected tracks.
This is a great feature for splitting CD length wave files into individual tracks. I'd love to see this implemented, so please let me know if I can help in any way ...