Ok, so you've come across a chest! Of course, you and all your party members what the loot inside.. However, you are forced to /random for it. Not anymore.
Here's what you do:
1) Someone open the chest, but
DON'T loot yet.
2) Now that you have the loot window up, have everyone else that wants the chest loot open it, but again no one loot it yet.
3) Once everyone has the loot window open, go ahead and hit the loot all button

Everyone will get what is inside.
Yes, many chests just have potions. However, I have come across chests with blues / yellows, especially in 4 dot populated areas... which are the places you are most likely to be grouped in. Anyways, enjoy
Feel free to vote me in if you like the above.