Required FS version to generate the filter (if the version user is currently running is lower, give a clear error informing to update FS). I don't like the current grammar.
Version of the filter itself (so that everyone who downloads it can check if the author has released a new version). Ideally same subgrammar as for the required FS version.
Some metadata fields for the author? 1 generic description string or dedicated (named) fields for each thing like author, forum link, etc?
It would be good to be able to specify: