You can click on the bottom right icon under the portraits to select all characters; faster than right clicking (the tab key will also bring up the character menu), though is not as handy as a hotkey would be.
I'd also like a hotkey to re-centre the camera on the active character. The F1/F2 keys work to select / re-centre for individual characters. A 'select all' hotkey would be good enough, though I would like a single re-centre hotkey that works for either individual or party selections.
Either character can use potions from either inventory, so there is less need to swap them around.
As I stated above, I've already found a need. Let's say your Deathknight picks up potions of agility or intelligence and you want to give them to your character. You have to drop it to the ground first and pick it up with your main character.