Have "O" set to "expand and collapse post" and have only "V" set to "Open post in a new tab".
I wanted to make a suggestion. Instead of having both "O and V" set to "Open post in a new tab", why not change it so that "O" is set to "expand and collapse post" (like it did in Google Reader as well as AOL and Diggs reader). And just have only "V" set to "Open post in a new tab". for some reason I thought it was this way when I first started using "TheOldReader" or it could just be my imagination due to being used to that configuration. I feel this would be more keyboard friendly for people that prefer using the keyboard over the mouse. This would alleviate having to click on the post topic to expand and collapse that topic.

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homie commented
I'm glad I could help ;)
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Daryl commented
@homie, Thanks! I totally overlooked the "X" shortcut. I don't mind or have a problem with having to learn new keybinds. I just missed it. Now that you pointed it out I'm all good. I thought the "Toggle post" option was missing. :)
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homie commented
I understand you want to bind your keys just the way you like it and I'm all for the settings page where you can change the keybinds, but for now you can use 'X' to open post in the list view. In all honesty it doesn't take much time to get used to new keybinds ;)