BB Curve :: Locking Keypad Changed, Can't Revert?

Device info

Your carrier: Sprint Model info and OS version: 8530 CDMA, v5.0.0.654 1108 4.2.0.298 Did a battery pull fix your issue? No

I recently upgraded my BB to the newest software available 5.0.0.1030, and in doing so lost a little bit of functionality. Mainly, I used the "Left" Shortcut Key on my Curve to "lock" the keypad. Also, when I wanted to unlock the keypad, I could hit any key on the keyboard, then hit star and send to unlock it.

Since the update, I've noticed that there's no way to bind the left shortcut key to locking the keyboard - it doesn't exist anymore. While I can still lock it by pushing and holding A, the left-shortcut-button was instant.

Next, I also notice that to unlock it, I now have to push the mute button the top of the phone. Since my phone is placed in my pocket, I've actually (several times over the last week) inadvertently hit the mute button by mistake, releasing the keypad and actually pocket dialing someone!

I tried to revert to the old operating system using my BB desktop software, which is the 5.0.0.654, but the keypad lock/unlock seems to remain unchanged.

Is there a way to make it look like the way I opened it up from the box again?