You can click drag an item from the ground and drop it onto a character's portrait to send it directly to their inventory, without needing to send it to yours, open yours, right click and send it to them. You can hide equipped musical instruments. (Same way as helmets, hover above the equipped instrument box on your sheet and a checkbox appears). You can throw a toxin (simple, wyvern, purple wyrm, etc) onto the ground in camp and dip your whole party's weapons into it, the dip will last until long rest and the toxin puddle will last for days. You can place a Potion (including Potion of Speed and some Elixirs!) on the ground near several characters, grouped up together, and shoot it to make it hit everyone in a small AOE. (Edit: Yes, I know you can just throw the potion - but throwing is an action, whereas an offhand attack is a bonus action, and personally I always run a thief.)