I know it is always nice to have the functions in one place but until Lansweeper adds this you should be able to do this in regular MS tools. I am not sure which server version introduced this but in 2008R2 (and probably Server 2008) there is the Active Directory Administrative Center. This is not at all the same as AD Users and Computers. There is a Global Search item in the navigation tree. Under this global search there is a drop down button to add some quick search criteria. One of these is users whoose password has no expiration date. It is a very quick and easy search.
