All Jazz files assumed to be binary?

So, it seems Jazz doesn't do any file content snooping, as in some other SCM tools, when first loading a file into the server, it just marks all files as "application/unknown" with None as the file delimiter, i.e. effectively treating it as binary. Unless of course you go through the trouble of adding all your custom suffixes into Preferences as Text content type...which doesn't work for files with no suffixes. This is pretty annoying for people with huge projects to migrate into Jazz.

Is there a way to designate the Jazz props for files not recognized with explicit suffix maps? I notice in Prefs->Team->Jazz->File Props the offending "File names and Extensions" entry, but I can't remove it or change it. Nor does adding "*.*" to the Text type do anything.