it would be a fast and easy way to get the md5sum so c&p it for example.
Uff, that's a rather special feature, which does not seem to belong into the default properties dialog. You could however write a plugin to add an "MD5", or probably more generic "Checksums", tab to the properties dialog.
ok, i wasn't sure how difficult this would be. i agree, that a plugin would be the better solution then.