Cookies Toolkit 3.1.3 works in CS6
For those curious about this older extension's compatibility with CS6, I can confirm that it seems to work fine in Dreamweaver CS6. I haven't done exhaustive testing, but I'm using it for setting and recalling session variables in an online app I'm building for a client and it seems to be performing as hoped.
As for getting support from WebAssist for this extension in CS6, well that may be another matter. If you're building for or supporting a site in PHP, then the new Data Bridge extension fits the bill for official CS6 support. If you're not using PHP, look elsewhere.