Sometimes, if the focus is not fully on the timeline, only on some element of the timeline's contents parts, the space bar activates the drop down for Animation Clip selection and creation. Sometimes, if the focus is on the actual timeline of the timeline of the Animation Editor, this still happens. The Return key also does this. Please make the Return Key the key that does this always. Please make sure that if there's ANY focus on the Animation Timeline, anywhere in that panel/pane/window, that the Space Bar ALWAYS causes time to play, and never does anything else. This inconsistency is mind belter.