I've pinged the Product Manager to see if anything is planned for a future release. An update will be posted as soon as one is available.
You can create a composite filter which allows you to combine filters.
Create one filter with all you "Ors"
Here is a screenshot of a composite filter. In this example, I setup a smart filter that filter on a set of products (Firefox or java or reader) then I create a composite filter to start with that filter then filter again to use another filter to filter out superseded updates.
Let me know if this helps.
This looks like EXACTLY what we need. I'll test this and mark the answer as correct if it works.