No I hadn't heard that the use of coca cola being an accelerator.I can't see it working though being only sugar and caffeine unless one of the secret ingredients is an enzyme. You can buy products that do accelerate compost. We have one called actyzyme which comes in a pellet form and is used to reduce drain smells and help break things down. You probably have an equivalent compost accelerator available in your country.
http://www.actizyme.com.au/compost-accelertor/
I will look for this. With the coca cola it is something to do with all of the acid in the products that help with the break down. I will have to look it up and post the link.