Is it allowed to change resolutions so you can see more of the map?

I've heard that people who have a second monitor can do this, and they get a much better zoomed out view on the lane. Apparently it is possible to get this by changing something in a .cfg file. I just wonder if it is allowed, or can you get banned for doing that? (I saw a post in NA forums about a guy getting perma banned for doing that, and then unbanned, because apparently it wasn't against the rules. But it was from almost a year ago, so I don't know if it is outdated or not.) It seems that people who buy extra monitor can do it without breaking any rules. But about otherwise? Edit: For clarification; I don't mean to use any hacks or other programs. Because that is obviously against the rules. Just about altering the .cfg file.
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