It need serious improvements, absolutely, but it allows you to "partial regenerate" of all tracks in a single screen. This is how I use it and it saves me a lot of time.
How can it save you time when you can't even select a region of a full bar precisely?
At least in the Audio Edit Window or ACW Window, you can snap to 16th notes. Much easier to select a full bar to regen.
I don't think PG will do much to improve the MTV snap feature this year.
It's dead on arrival. Don't waste your time on it. Go back to ACW.