I, personally, have several characters on my account. I use most of them for gathering, however, I have 2 main characters for fractals and such.
If I'm to change characters to start gathering, all characters in the menu move around when backing out.
This may seem petty however, I believe locking your main characters in, say, with a yellow border so that they stay in place if another character is being used it'd be great.
I think this'd be both visually pleasing and just all around helpful for many people who switch around with characters a lot.