I don't think you can, you can get it to output to ISO or direct to disc but I've not seen a way to get it to do both.
Oh great, exactly what I was searching for. Don't know how I missed that...Thanks though!There is an option to burn direct to optical disc. On the target tab you should have 3 icons on the top left, First one is to make folder structure, the second one is to burn direct to an optical disc and the third one is to make an ISO image