> Is Lilypond-devel not appropriate for a feature request?
In this case: no, it's not the right mailing list, because the
original question isn't a feature request at all IMHO.
In most cases you can write a small Scheme function that does exactly
what you want, acting as a wrapper around existing LilyPond
functionality. For this reason you should always start asking a
question on 'lilypond-user' – the necessary Scheme code could then be
added to the LilyPond Wiki so that other people with similar demands
can quickly access a solution.
If the developers think that this or that might be worth a feature
request, they will tell so, usually asking for filing an issue in the
tracker.
Werner