For those of us working solely in mastering we typically only have access to the 2-track mix master, so no you can't jump back into the song tab to fix one element.
One workaround I experimented with was using Song mode for processing/pitch/capture, and then sending that to a new project. There are a couple problems with that though: If you use a single Song tab with the individual album tracks laid out on unique channels across the timeline, you can then send that to a Project to do your tops, tails, and sequencing, however the fade editor is not nearly flexible enough for me (previous posts here and here), and I'm still not totally sold on the way Project mode handles track markers, pre-gaps, PQ sheets, etc. plus there's no support for vinyl/cassette sides, meaning I have to go to HOFA for that anyhow.
Being able to do all work in Project mode, including automation, would be a great benefit. As it stands now I jump between S1, RX, and HOFA CD-Burn.DDP.Master to complete a mastering project. Getting closer to a one-stop-shop would make this mastering engineer very happy indeed.