As the title says, the vendor UI is in urgent need of a rehaul. If you ever tried to buy any significant amounts of anything, you'll know what I'm talking about: 4 mouse clicks to buy an item x 10? Either drop the confirmation dialog or allow us to buy stacks, this is boooooring!
Well good to know about it. I did try Shift but failed to try Ctrl
Still that is mostly undocumented. Would be nice to have it on a tooltip or something. Cryptic really needs to work on ways to give relevant information to players. It was bad in CoH but it's ridiculous in STO.