Are custom resultions allowed?

So I have a monitor that has 1280x600 as it's lowest resolution but league of legends settings doesn't allow me to choose this resolution looking into some posts and I can set it with cfg file but is that allowed?
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We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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