1) I am struggling to notate ending 1.-3. and then ending 4. It seems this is not possible currently.
Click image for larger version. 

Name:	4th ending.jpg 
Views:	32 
Size:	24.2 KB 
ID:	688

Am I assuming correctly that I have to notate this differently to get correct notation + playback?
Click image for larger version. 

Name:	correct playback.jpg 
Views:	32 
Size:	31.7 KB 
ID:	689