Is there a way to prevent the redraw() command from being an undo set point

One main function is like you mentioned, you want to show the user the document's changes before the script ends.

But sometimes when doing a lot of document manipulation where artwork gets put from various documents into other documents, the script will experience some kinds of bugs that would lead you to believe that the script is working with some 'outdated' version of where the artwork is supposed to be. That's when I stick in a redraw() and sometimes it was the solution!

Hmmm, that might help.  Is switching the preview a common tactic for helping with performance of scripts, it seems like it might a good strategy, just in general for scripts that do a lot of work.

And just to explain the original question better, say I have a script that creates 10 rectangles.  After the script finishes, pressing undo just one single time undoes all 10 rectangles at once.  But if the script creates 5 rectangles, then does a redraw(); and then creates another 5 rectangles, after it finishes, pressing undo one time no longer undoes everything, it just undoes the last 5 rectangles.  

It's minor, but I like the outline idea.

I meant undoing after running a script... one undo after running the script would take me back before running any of the script, undoing dozens of commands all at once.  But now that the script has redraw's in it, each undo only goes back to the previous redraw command.

It's minor, but I liked it when everything was being undone with just one command, as I test things the extra undo's feel excessive.