What if from the bank teller, you could open an actual bank. In the bank, you can store meebles, maybe a double chest of items, etc. based on your donating rank, you can have more and more chests and more meeble space.
Now trust me, I understand that we have enderchests, and town banks, but this could just be an addition.
One thing I want to push for is that what if the bank could be put under your name. So if you go offline for awhile, you could put your meebles in the bank and important items, and then leave. You don't have to worry about your items, so therefore you can enjoy a vacation you might take!
Just an idea, hope you like the idea!