HVS should make the lock on like this:

#1Killeryoshi8Posted 4/3/2010 2:21:23 AM
All credits to nintendomaniac

Make it just like in Metroid Prime 3, when you lock on without enemies on screen. It makes your screen lock, while you still can aim without having to worry about turning.

I think this is used in Modern Warfare Reflex too.
Monster Hunter 3 for the Wii