Please please Allan include block undo/redo. At least as an option. Not only is it standard on all other programs (that I know of) I find it far more usable. If I want the latest character I typed undone, I'll hit backspace. I currently sit and try to figure out a good XML scheme for myself, and I find that I change whole words very much, such as tag-names and allowed values for attributes, it's a pain to hit the undo button so many times as is necessary.
Andreas