Creditors - Quantity Entry suggestion

Creditors - Quantity Entry suggestion

Is it possible to allow for decimal points in the quantity column when capturing invoices. For instances if we are charged for repairs that are at an hourly rate, the invoice will say 1.5 hours @ R 800.00/per hour. The system does not allow you to enter decimal places in the quantity column, so I have to enter one amount rather than indicating the actual rate at which we are charged.