No, don't put the beer caps back on, they will just take them all off.
And on your second point, you're right, often there is only one cashier and he'll be taking empties and selling new beer. But if there is multiple cashiers open in a big Beer Store during a busy time, there's only one that they will want you to take empties to, usually right along the wall.
Personally if I'm taking empties back and also want to buy beer that's available on the racks, I'll set my empties on the side at the back of the line, go get my new beer, and then push them both up together.
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