Custom plist for different builds

My plugin has 4 builds, debugMono, releaseMono, debugStereo, releaseStereo

I want a different plist for the mono and stereo versions. Is there anyway to do that with the IntroJucer?

You can add custom plist values that will get merged - does that do the job?

Thinking about this more, I don't think what I want to do can work. I'm going to have to create seperate projects or targets rather than just schemes.