Thre are a few things about Melodyne that could be integrated better.

1-The way Melodyne scrolls or doesn't.  Example: your project Now time can be 3:01:01 and when you open Melodyne, it may be at 45:03:15 or whatever.  You can't scroll Melodyne to the right place with the scroll wheel on the console: you have to drag the scroll bar in Melodyne separately from the project.
2-Bouncing.  You have to bounce the whole track.  It would be good to have an option to bounce invidividual clips or sections, and then be able to drag-copy the bounced versions.
3-Syncing.  Melodyne can get out of sync with the overall project.  This is hard to fix once it happens.
4-Playing Melodyne alone.  Double-clicking in Melodyne will play the audio solo, but only if you have hit play in Sonar sometime since Melodyne has been opened.  The Stop button in Sonar may or may not stop Melodyne.  When it plays alone, of course, the Now time in Sonar does not advance.

Bill, are you using Melodyne in a VST mode or stand alone?  I have had some of these items happen (especially #1, lack of scrolling even in its own stand-alone window).   And yep, I just get used to dragging the scroll bar at the bottom, to get the area I want to edit or preview.
Bouncing a clip or section would sure be nice - I hope that's an option at least in some near-future upgrade.  I have to say I've never had any synch problem working in the stand-alone mode that I do, so far.  That would tend to ruin one's day and I imagine it would mean reverting and restart the edit from scratch. 
Thanks for the points, good to keep in mind!
John

Would that it were so...but I don't think that the ol parent company would like having Melodyne stomping the beejeesus out of V-Vocal inside Sonar on a daily basis.  Or would they?

JD1813, I have never used Melodyne stand-alone--always as a VST plug-in.  I may try it standalone sometime to see how I like it.