I don’t see any way to import existing WAR files into MyEclipse, even if they have the source code with them. I’d really like that capability.
On a related note, the WAR export wizard does not have an option to include source code. Since I occasionally share WAR files with others, I would like to be able to do that.
(BTW, we still don’t have XHTML support, which has been promised for the last couple of versions.)