How about adding a feature to "check off" each transaction that clears so we know nothing is slipping past.
Here's the issue I'm having. Sometimes, it takes a while for transactions to go from "pending" to "clear". If I edit the "pending" transaction entry in Mint, it creates a duplicate entry for when the transaction finally clears on my credit card. If I don't touch the pending transaction, it will eventually clear inside mint as well like it should however it doesn't show up on top of the transactions lists because it may have been 3-4 days ago. This makes me miss transactions that I would like to tag, re-categorize etc.
I think a great addition to Mint would be an ability to force acknowledgment of each cleared transaction so I know I've seen and tagged every transaction that's posted on my cards.