There’s a use case (two box sets in a single project) where Compiling the 2nd boxset starts book numbers at one, when they should start at five. How hard would it be to let us reset a stream to any number we want?
I figured out how to do it without a new feature. Just put <$w:chapter>-<$w:chapter>-<$w:chapter>-<$w:chapter> in front matter (for the 2nd boxset only) and make the text white.
I wonder if you could just sink that into an in-line annotation, since compile can remove these at compile time (and probably is by default), so you would not need to turn your solution invisible. The only question is if the code is processed first before the annotation is removed in the compile process. (Not near my mac, so can’t check.)