Don't push a shit, many apps DO change 2g/3g. And it works fine, so it can be done. My system widget on Xperia J are able to do it, without showing other wibdows/activities. I'm uninstalling it til it's fixes. You need more icon styles as well

I already reported that on my Xperia J, when i choose an item, the seledted champ disappears. Like: choose a champ, choose an item, then there's no champ. Also app crushes when i choose Nami's W