Some of these have been mentioned before but I'll pull a few wish-list items together here.
Top items:
1. Text box without outline (just free-floating text) [edit: never mind, I just figured out how to do this LOL]
2. Change color/properties of text box outline [edit: ditto]
3. Adjust line-spacing between text (titles, fret numbers, etc.) and fretboard; they're usually too far away for me
Also:
4. Type/paste font name -- I have a bazillion fonts and I hate having to scroll for the one I want
5. For connection lines, make dashed/solid appearance a property of the line, so we can change dashed to solid and vice versa
6. More appearance control over connection lines (as with edited lines): wide/narrow dashes, dots, arrowheads, thick, thin, etc.
7. Curved line segments on lines and connection lines. These don't need super-duper drawing tools, just a way to have half- and quarter-circle arcs would do it
8. Free-floating connection line segments that aren't linked to a dot at one end
Thanks