If a complete system is needed from scratch then the deal can be negotiated before placing the order. The current gig only deals with already developed systems for changes. These changes should not be greater than 300 lines of code or 5 webpages. If changes exceeds the limit then again before placing the order negotiate the deal.
I have added Gig Extras under the current Gig. It can be seen and opted to the package when you place the order.
I have already completed 31 orders successfully with excellent comments and more are under progress. I have a team of professionals which can deal multiple orders at a time so don't worry for the pending orders.