I'm also running Dreamweaver on SuSE 9.1 (Pro), and have tried both with Crossover 3.0.0 and 3.0.1. FWIW, it went in very smoothly with both versions in my system. I'm also having no issues with the extension manager - runs as expected. The only minor issue was that it did not create an icon for the extension manager. I have just checked, and you should be able to start it with a fairly simple command line - not many parameters passed to cxoffice. The command I used - you may want to try this - was:
/opt/cxoffice/bin/wine '/home/username/Path/To/Extension Manager/Extension Manager.exe'
If this works for you, you can enter this as the command for a link to application. Also, you may want to try replacing the "~WB~" with "/" in that script - it's basically trying to do the same thing as my command above.
Finally, if it still doesn't work, try launching either the script or the direct command from within a console - it should give you more feedback if there was an error message. You can also try passing the option '--verbose' to cxoffice, like so:
/opt/cxoffice/bin/wine --verbose '/home/username/Path/To/Extension Manager/Extension Manager.exe'
If you do this you will get quite a bit of output, but it may help you to debug what's going wrong!
Hope this can solve your issues - I know I would be kind of annoyed if I couldn't use the multitude of DW extensions out there ;)
Happy to help!
Regards,
Peter