Pankkake,
You should add a feature that allows you to actually print out BEKs in some standard denominations ($1, $5, $10, $20, $50,$100, etc). When you print out the bills, the amount printed should be deducted from your balance.
Hahaha! That would basically just be working in paper wallets into the client, but it would be pretty cool, and very appropriate for Bernankoins.