I use my side account to sell spare food uses and craft decor, so I'm always sending a lot of items over when transferring things. Holding down ctrl and clicking EVERY SINGLE ITEM that I'm sending over becomes very tedious very quickly. There is also the issue of only being able to send 200 items in a single transfer. When clicking one item at a time, it can be easy to lose count of how many items I'm sending. What I propose is, similar to being able to sell single or stacked items at Monkey Business, we also have the option to send single or stacked items to other players.

EDIT: Yes, I'm aware that I can ctrl + scroll, but if you have a very large hoard, things will be very spread out, so that wouldn't be very useful. This would be extremely helpful for mobile users, who don't have the option to ctrl and select multiple items at once.

SUGGESTIONS:
Agryo [FROZEN, rolls Thurs] (#70050)
"Here's a little somethin' I thought of:
Say this system is in place and I can transfer stacks of items; I want to transfer as many Lucky Feet as I can to my other account, but I've got over 200 in my stack. Perhaps, if I select my big ol' stack of Feet, the system could make the transfer be for 200 Lucky Foot items out of that stack, instead of needing to go and individually select all these damn feet despite the system being in place."