I too am playing around with the scent barrier and conflicting factions. Maybe my ideas will add or reinforce some of your own.
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Sprucetuk is not run by the smartest scientist, but rather by a very popular and enjoyable charlatan. Think “The Governator” running California. He has no right or reason to be in politics but people were so tired of the last guy that he was just in the right place at the right time. Fun twist becomes who is this clowns advisers? Who is really running Sprucetuk?
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This one is complex, way out there ,and goes against some of the purity/rules of Mouse Guard but here we go… The scent barrier doesn’t just keep predators out, it keeps MAGIC out as well. In effect The Mouse Guard (those in charge of redistributing the concoction each year) don’t just protect the common mouse from expected threats but also from the unpredictable power of magic as well. I’m thinking that each type of magic (illusion, transfiguration and so forth) is a new skill that requires some rank in archivist. All kinds of fun comes from this. Who knows about it? Are there any wizards who seek to take down the barrier? Do weasels know any magic?
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One last idea, more food for thought really. Why is there only one Guard? Why isn’t anyone competing to do it better? Are there any thieves guilds, secret societies, or political extremists who claim to have the same aim as the Guard but come at it from a different angle? I mean, has any mouse created an organization with a particular agenda different then that of the Guard? I’ve introduced “The Guild” into my game. Basically an information peddling underground organization. They don’t have any ill will towards the Guard or mousedom in general but simply think that there is a profit to be made from exposing, handling, and concealing information and secrets.
Hope this helps, or at least gets the wheels turning.