Apply account discount


I know Discount/Price Books are on the to do list for upcoming releases. but in the meantime i was trying to figure out a way to apply an account based discount. Has anyone come up with a way to apply it automatically to invoice/quotes? as we have a lot of accounts that receive discounts who put in order containing many different items at once, so manually finding what the accounts discount is and adding it to each item is just way to time consuming.

I was thinking add a custom field to the account page and when the account is selected is pushes it into the discount field on the line items? This is beyond my programming abilities but if someone has done this before that would be great. any advice or suggestions would be appreciated.