Stephen

As someone who browses these forums on my iPhone often, I much prefer using the Lo-Fi interface.

"Power" isn't the only thing to think about when browsing on a mobile device, connection speed is also, so it makes sense to serve a Lo-Fi version to mobile users by default, if someone has the power and speed for a full view they can then switch it, but if they don't have the power/speed for that showing it by default isn't very helpful as it will take a long time to load/render before they can switch.

I also think it would be a handy thing to show the user.

Possibly have 2 boxes to enter the ban reason, one that is shown to the user and one for admin users so you can elaborate on the reason for other administrators. If none is entered for the admin it uses the same reason as the user, if none is entered for the reason nothing is shown for them.