I'm not against adding tracks to the mixer but doing so does NOT remove or reduce the need for a solid bar-by-bar freeze feature.

I can already do lots of tracks for comping if I want to. I can just create my song, save it and then fill all tracks with my solo instrument and get a quick set of 7 tracks for comping.

But being able to freeze one or more bars would allow me to stay longer inside BIAB. And I get that bars don't always line up so that is no problem...if I don't like the result I just hit regen again.