We support the current version and one version back. We support 2 versions back for the first 6 months of the product lifecycle. So since CS4 has been out for more than 6 months we have started only supporting CS4 and CS3.
Do you have any information on your statistic "Most people are still using V8.0.2". DW v8 came out in 2002. I'm surprised that most people haven't updated in almost 8 years.
I am surprised this would be the case. I would be very interested if you have any actual data to back that up.