MarketPress: Custom notes field on checkout

Is there a way to allow a customer to add custom notes upon checkout? I am using PayPal for payments right now and I realize they can add something in there but I'd rather have it done on the checkout page... as I will be using another form of payment (cash/money order/check) when that feature becomes available.

p.s. Is it inappropriate to ask all my questions like I have been? I figured it was best to separate the questions in unique posts.. and I have a lot.. so I wanted to get them out there and get things rolling as quickly as possible. Plus, I have read through all previous posts related to MarketPress and since these aren't covered (unless I missed something) I figured they could also be beneficial to other people. Let me know.