North and South Korea are not official, Congo (for RoC) is though. Some countries also prefer to stick to the long forms
(Also the reason we normally don't accept RoC is because it gets confused with RoC: Republic of China)
I have heard people argue over every silly little thing on this site ( even things which you thought were so clear, noone could make an argument about it). But have never seen people argue about ROC. Like : "Can you accept roc as a type in?" "No you can't because it is not clear what you are referring to" but then spoken in an agressive manner with a lot of ego treating the other as absolutely wrong and dumb, obviously..
Would you kindly accomodate COMOROS into the list of possibe answers for the Question Item C M O R please ??
Or like tap water running down from the faucet?
Maybe you just learned how to say the letter 'p' but weird letters follow?
Does Aruba count?