When you print an invoice, the name and address does not line up with a windowed envelope, so you have to fold it differently for the name and address to appear in the window. Could you adjust the invoice to be similar to the statements, where it will line up with a standard business paper fold?
While I don't have the exact same problem, it would be good to be able to adjust the layout of the statements. I often end up with 2 - 3 page statements that could easily fit on 1 - 2 pages if minor tweaks to margins could be done.
We use window envelopes and really need our return address to show at the top left corner so that we don't have to use address labels all the time. It would save a lot of time if we could layout bills the way we'd like.