Yet another feature was added to AMOS filter today. There is now a permanent link ("permalink") for the current filter setting generated - see the link near the filter submit button. You can bookmark such link in your browser or use it in the tracker, email or forum post. Opening that link sets the filter setting to the given values.
For example, this link sets the filter to show missing strings from the pt_BR language pack. I can bookmark such link as it is usually the entry point for my translation work so I do not need to set it every time I come to AMOS.