Can I use your tool to distinguish between unimportant and important resteems...?! ;-D

That would be a useful enhancement. The "Steem mind-reading extension"😉. Long term, I suppose it would be possible to provide more useful filtering than all or nothing, though. Account lists could be maintained, for example, to filter resteems of posts from accounts that require resteems for their contests - similar to how ad-blockers maintain lists of advertising sites. This hadn't crossed my mind, and maintaining such a list is beyond my reach as a part-timer, but I'll keep this need in mind for future possibilities.