Hello, the trill interval option should be able to use all the accidentals used in the piece or should be customizable. i.e. for 24 - EDO I should be able to use the quarter-tone accidentals. It is very common to do that in contemporary music.
Maybe there is a way to do it and I just couldn’t figure… is there any workaround for this?
No, this is not currently possible. We are working on improving the handling of trills at the moment, in terms of making the interval you choose for the trill have the appropriate effect on the accidental state – e.g. so that an accidental introduced by a trill interval is handled correctly for other notes later in the bar. Initially, at least, this will only apply to common practice music in the 12-EDO tonality system, but we will definitely consider how best to extend this for extended tonality systems in the future.