re. no way to (in a single action) get to A-The start of the timeline and B-The start of clip i the MIDI editor
if you're asking about moving the play-head to the beginning or to the end of the MIDI clip while on the piano-roll editor, then yes, you're right: there's no way to make that unless you set the edit-head/tail (blue) markers accordingly and then use Backward [<], Forward [>] transport actions; note that SHIFT+Backward/Forward will move the play-head to the absolute beginning/end of the whole session contents, not the MIDI clip in view.
however, if you're asking for moving the view or immediate scrolling to the beginning or end of the MIDI clip sequence, then HOME and END keys will do just that respectively, provided the piano-roll view is in focus.
re. no way to (in a single action) get to A-The start of the timeline and B-The start of clip i the MIDI editor
if you're asking about moving the play-head to the beginning or to the end of the MIDI clip while on the piano-roll editor, then yes, you're right: there's no way to make that unless you set the edit-head/tail (blue) markers accordingly and then use Backward [<], Forward [>] transport actions; note that SHIFT+Backward/Forward will move the play-head to the absolute beginning/end of the whole session contents, not the MIDI clip in view.
however, if you're asking for moving the view or immediate scrolling to the beginning or end of the MIDI clip sequence, then HOME and END keys will do just that respectively, provided the piano-roll view is in focus.
hth.
cheers