The complete source for InsideUO is available at http://uo.stratics.com/heptazane/insideuo/index.shtml and I know there's a Delphi equalent of visual basic's "SendKeys" which allows sending keys to another window - but I don't know how to add this feature myself
I am however hoping there are someone out there who are capable of doing it though - this would be a very neat feature to have in InsideUO, and would (if possible) make it an even better program for world-builders and GMs than it already is