BB Curve :: Password Lock/Keyboard Lock On 8520?

So I updated my Curve to the new version 5. I noticed that there was no more Keyboard Lock/Password Lock. From my previous software, it was named Keyboard Lock and I set it as one of my convenience keys. After the update, I noticed that it no longer existed. A friend of mine purchased a brand new Curve 8520 with the update already installed of course. She had the Keyboard Lock but it was named Password Lock instead. I have been searching for ways to get this feature back to my Blackberry because I feel it is more convenient rather than the "silent/mute mode" button located on the top of my device. The shortcut to lock my phone which is the "A" on my keyboard quickly "locks" my keyboard only