You got it man (The Pitch drift tool).
I also noticed why I couldn't do certain things in Melodyne when I had the base version that ships with Sonar.
The base version will allow you to do pitch correction but not with the same accuracy as the editor version.
I upgraded a while back and I must say its one of the most useful tools in my bag of tricks.
I love Melodyne. It takes a while to get the grasp/the jest of how everything works but once you do have a good understanding this tool will take you places.
I sometimes see people with complaints about trying to fix 5 minute chunks of data.
In my opinion Melodyne was not really created to do this, it works best by fixing smaller chunks of material.
Another personal opinion is if you do have a 5 minute chunk of data that needs fixing you will be better of re recording the whole track again.
I also suggest after making corrections, use the "Bounce to clips" function.
Just make a back up of your original material. I don't but I have heard others complain of not being able to retrieve the original (which IS in your audio folder) but never the less keep a back up.
Another opinion here is..if your fixing a track, it was never perfect in the first place so what have you got to lose ?
An imperfect back up ?
Hope this helps.
Chuck