That is something I am looking into, but it is low on the todo list.
All of the buttons do turn blue, but it appears that the iPhoneIS is only showing the button "pressed image" while you are physically depressing it. My current theory is that since we know our codes so well, that we type them fast on the keypad screen. So fast you either beat the image change or it happens so fast you do not see it. Linger the keypress a bit longer and you will see the change.
I was thinking that too so I held my finger on each button to no avail. I am still unable to arm or disarm via numbered keys.
Edited by kccustom, 23 October 2008 - 06:26 PM.