You could also add a column at the end and leave it out of the printarea, so that wouldn't pose a problem.
The only thing is that you will have to come up with something that, in order to make your system work, makes every row unique to another.
In that last column you could f.i. use a formula to make a concatenation of some parts of the first three columns so to create a UI.
Put your current data into a Table and the formula is copied automatically with every row of data you add.