I'm not sure why importing from TFS doesn't detect that project's nature correctly. (Are you not checking in .project
files? Are you using Maven?)
Regardless, if you want to go the route of importing an existing project from disk, just go to the Team menu, select Share, then select TFS. It should detect your working folder mappings and simply set TFS as the source control provider for that project, which should give you all the TFS bindings from within editors and views.