While I am not a WebAssist employee, I can confirm that I am using all of those extensions on the latest build of PHP 5.3.* right now.
You shouldn't have any issues.
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.