While waiting for proper chunk undo, is it possible for a macro or command that can do something similar? I'm thinking it would recognize text between spaces for each chunks; that way, whole words undo at a time. It's not perfect, but would certainly be easier than cmnd-zzzzz...
Ok, I actually recorded a macro thats halfway decent. All it does is select the current word and deletes it. Not perfect to be sure, but in most instances where I'm typing away and want to delete the last x chunks it does the trick.