One really great feature about Sublime Text is the fact that when you quit and reopen, all your windows come back just as they were. It would be nice if this functionality extended to individual windows you have open as well. Currently you can close a window belonging to a .sublime-project and reopen it and all your files are restored exactly how you had them in the current workspace.
That is great. If, however, you close a folder that is not from a .sublime-project then reopen it, it opens up without any files open. It is not a huge deal, but I think it might be nice if workspaces were handled automatically by Sublime by keeping workspace files somewhere else in the file system mapping them to folder paths to be able to restore the files.