You probably can add it. I know people removed the default lock screen from Sense via package and file removals. Incidentally, the Sense lock screen was one of

You probably can add it. I know people removed the default lock screen from Sense via package and file removals. Incidentally, the Sense lock screen was one of the reasons I wanted to get away from it, the down-up motion kept unlocking my phone in its sleeve (not an issue with left-right on the default). The ability to silence the phone from the lock screen is another feature I like about the default lock.