Hi guys,
David and Herbert (good to see you here!) have both made some excellent points about editing for a good performance. It does take time to do it well, and Notation Composer does provide a lot of tools to help with that.
One way that you could speed up the task a bit is to create a "library file" of chord types (eg. Maj, min, 7, etc), which you can then simply pull up and copy/paste into a new file that you're working on. In other words, you could create a library of the chords you most commonly use, and tweak the performance of those chords in the library file (as David and Herbert have both expounded on). Then whenever you are working on a new file, have that "library" file open in a second window (you can use the Window menu to put them side-by-side either horizontally or vertically), and copy/paste chord "blocks" (with their performance already tweaked) from the library to the song file. It's then easy to quickly adjust the pitch of the chord (say from "C" to "D" chord) just by holding the "P" key and pressing the Up/Down arrow key as needed to adjust pitches up/down a half-step at a time.
Granted this method gives the same duration adjustments for each time you use a particular chord type, but it's a way to save time editing for quick composition.
Some years ago we had a member (Fred Winterling) who used to collect pitch bends in such a library file, for use in his other compositions, so my idea isn't exactly original
ttfn,
Sherry