Yes.
There are many good vegetable garden books. A good book to read is Starter Vegetable Gardens by Barbara Pleasant.
Considering the fumes from Bat feces can be deadly, probably not. That aside no feces of any creature should be eaten, there is a reason that the body removed it in the first place!
They are EXCELLENT for a vegetable garden.
Manure from several species of animals makes good fertilizer for outdoor gardens.
Vegetable gardens are great for families. Everyone should eat more vegetables. Sometimes children are more likely to eat vegetables that they help take care of.
Earwigs are often accused of being harmful, but rarely cause any damage. They prefer to eat dead insects and other matter.
ladybugs and spiders are all i know that are good for gardens
There are a variety of companies that design patios and outdoor living spaces. A good place to start is Better Homes and Gardens online. You can find several design examples at http://www.bhg.com/home-improvement/patio/designs/.
Bat dung is sometimes reffered to as guano it makes good fertilizer
Bat manure is called "Guano" and it is used for fertilizer.
It is certainly not a bad vegetable.
A good baking substitute for vegetable oil is applesauce.