ITT: Someone picking on me for the sake of picking on me while having little else to say.
I'm not making any radical assumptions. it's well known that on a technical level the game is poorly built/designed in various ways. For examples, look to the game's use of DirectX 8, which is going to be eliminated from windows in the future, and the game even barely uses that properly. Of course, the technicals of implementation are true of any change to the game. SE has a history of breaking random stuff whenever it updates the game. My AV in the mog house was a joke, of course- but it was a joke with a point. Do we know exactly the nature of how any specific peice of the game is implemented in code? No, we do not. However, we can derive a vague idea in some cases from the time it has previously taken them or is taking them to do certain things, and from SE's own statements about how easy or hard something would be to implement.
Its going pretty far to say this change would "make the game less annoying to play." Is it really THAT annoying that in some cases, one, possibly two extra presses of up or down are needed? It also means that, while sometimes fewer keypresses are needed in total, you now need to press three different keys (up, down and one of left or right, since either would have the same effect with two columns) to fully navigate the menu instead of two (up and down only), and briefly holding down one key will no longer cycle you through all the buttons. So if you're looking for a more analytical explanation as to why this isn't much of an improvement, there you go. I didn't really want to have to say that. Very slightly improving one menu out of many in the game, which itself is just a very small piece of the game as a whole, does not make the game measurably less annoying to play.
You say "how dare someone make suggestions..." I say, "how dare any of us discuss said suggestions on a discussion forum?"