Unless I've missed something but it would be nice if an addressbook (LDAP) entry could be integrated in the WAC screen. I could lookup an address and initiate the cal from the WAC screen.
It would even be nicer if the WAC could be turned into a desktop application making it more robust. E.g. http://www.appcelerator.com/products/titanium-cross-platform-application-development/
And if all actual parts (my calls, call queue, extensions, conferences, park orbits, ...) could be made modular I could construct my own views and define my own look in changing the css.
E.g. I am not interested in a call queue, park orbits or conferences but would like to see the status of the extensions. And I would like to see this in a very compact window view on the site of my screen.