We do put a good bit of thought into where our extensions are accessible from within the Dreamweaver user interface, but we're certainly open for improving the user experience. What specifically would be "improving integration" mean to you? DO you have some examples of what you'd put in a different/new place? 
Example: Right now if you have several different webassist extensions they show up in several different places under "Applications > Server Behaivors". I think just having 1 point called "Webassist" and from there you go into data assist, universal email etc. Even splitting the product by functions like forms, email, data etc. This way it is much easier to access it and you can actually split each product group into separate functions...
