Ooh, carrot! *munch, munch*
Not a big problem, really.
The way OpenOffice handles any column addition changes is that it'll automatically adjust the formulas, so all I need to do is add the columns, check the units and then copy the formulas from some column and adjust a couple of things for things to show correctly, so while it will be a bit of a headache, it's not going to be a major one. It'll just be part and parcel of the DB update for the next patch when it comes out. But I couldn't resist making the above post.