If you have a USB IR Reciever for use with Windows Media Center you can use it with XBMC or Windows Media Center. The codes were in the database for the one I own.
[Link: shop.ebay.com] Some of the buttons are a little different in XBMC but it works. This is one way to do it without Prontoscript . One thing you can't do with the IR is type Text but, I think a on-screen keyboard appears when you need it .
I was wondering if anybody might have a way of adding text and mouse over IR ? Maybe a code in the database I can try.