Keep boxes checked on selected emails even if I accidentally open an email so I don't have to start over.
It happens very regularly where I'll have over 40 messages selected for deletion and I accidentally miss the select box and open an email instead. While that's mildly annoying, it's very frustrating to start all over and have to select all of the messages again. I've read other submissions where people would like the check box bigger, but I would love if the boxes remained checked/selected after you back out of the email you accidentally opened.

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Jolie Lindley commented
YES!! I came here just to post this. It's a freaking PAIN. I use this account for a lot of my "shopping" promotional emails, and sometimes I want to delete 40 or more at a time without reading them. If you accidentally open one of them, ALL the check boxes are unchecked when you do. Gmail doesn't do this; why does Yahoo??