Actually that feature works only with keys (ex: "From key C ... To key C#"), but I think it would be much better if the choice were in # of semitones. There are situations (when working with songs that include key changes, or when you are working on the structure of a new song and you have just forgotted setting the key, for example) where transposing a number of bars in keys just doesn't make much sense, IMHO. TRansposing a set of chords a number of semitones would be much easier and won't have these disadvantages.