Our Understanding: Presently, if you have a stack of an item, and you wish to add it to a stack in the bank, you have to remove that stack from the bank, add it to your inventory, maybe hit merge, and put it back in the bank. You can't just move that stack to the slot in the bank with the items already in it. Even if you hit merge, then you have a cooldown of using it again
Our Proposed Solution: Imagine being able to hit a button for a single bank inventory that says "auto-add" and it sorts your inventory into the bank in terms of the stackable items already there. Like you have 3 fine leathers in your inventory and 7 in the bank. It merges them into the bank for you and completes the stack
The Benefit: Games like Dungeon Fighter Online (DNF overseas) already have a function like this and it greatly expedites the amount of time required to sort through bank items and transferring between alternate characters, which Mabinogi seems to want you to have at least a few of given the characters cards we've accrued over the years
Some players may mostly rely on pets to transfer items or their bags, but the bank remains a reliable way of transferring account bound items (as opposed to character bound). To improve this feature would greatly increase functionality and player usage of the bank