Hi
Your Food Delivery script would do well to have a clients list (allows clients to log in) in the admin side of things that automatically entered the clients details when ordering. In Australia (and I guess other countries) there are a number of food companies that produce dinners that can be ordered in lots of 10 etc. and delivered on certain days of the week in particular suburbs.
It would be useful to have a variation that allowed this to happen.
See Lite & Easy in Australia.