SVN does have the capability of storing metadata (properties) along with a file. The properties are basically just key/value pairs, however there are some special keys like the ‘svn:executable’, if this property exists for a file, Subversion will set the filesystem’s executable bit for that file when checking the file out. While I know this is not exactly what you are looking for it might just be enough (was for me).
There are other properties for line ending (svn:eol-style) and mime type(svn:mime-type).