The playback cursor is not repositioned when selecting items other than notes, rests or measures
The manual recommends that, when starting playback, the user should "click on a note, rest or the blank part of a measure to establish the starting point".
I often find that, when attempting to establish the starting point, I accidentally select a score element which isn't a note, rest or measure - for example, a note stem or a clef. Therefore, the playback cursor's position is not changed. I usually only realise this when I've already pressed "Play", and the viewport has been whisked away to some distant part of the score.
Most score elements have an obvious correspondence to a particular time-point in the score. For example, a note stem "belongs" to a particular note, while a clef "belongs" to the start of a particular bar.
I suggest that, when a score element other than a note, rest or measure is selected, and the selected element has an obvious position in time, the playback cursor should always be repositioned to that element.