It's not a bad idea... even though It's the job of a source to determine how they send thier merit..
But do sourced merit actually do expire?? Only do see such statement but have not seen any post of merit source talking about their monthly sourced merit expiring instead I do see the ones who parade up to 4k+ Smerit.
Theymos himself mentioned it in the post Igebotz quoted.. Also, why would they need to make post about it claiming their merit expired when it already clearly started it does expired.
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I don't know how to explain this to you - if you're given 10 and manage to exhaust only 5, you get only 10 again the next month, the other 5 doesn't roll over.