@pwessel - excellent!
An option to have the labels in mid interval position would be very useful indeed. Is centering the word possible or just aligning the left end to mid-interval?
Having slanted annotations in mid interval I would not consider too important. If there is an option to center the interval annotation either horizontally or vertically that would cover (at least in my case) the bulk of the use cases. For the others I would then revert to annotate the base of the interval/cpt break using the new -S+a option.
What would be useful though is an option to specify a “shortname” for a longer custom annotation - say in the case of the Stage names to have something like
5.333 255/255/179 7.246 255/255/179 ; "The stage known as Messinian"; TSKAM
7.246 255/255/102 11.621 255/255/102 ; Tortonian; Tor
11.621 255/255/89 13.821 255/255/89 ; Serravallian; Srv
where the last column would be a short name for a longer annotation.