sahbi:
I can only speak from my own experience, which is that briss at least retains a pdf TOC (I don't use pdf features other than that). In combination with a 1-column split, I find pdf's perfectly readable.
The feature you talk about is not currently in PRS+, and I'm afraid it's not planned for a future version either. If you would like to see it added, you can post a feature request
here. If you're interested in coding it, I'd be happy to give you some pointers to get you started.