I sorry, I'm not much of a forum poster so my point doesn't seen to be coming across.
Yes, that will make you jump to the next unit when you are locked and centered on a unit. But if you move the mouse too far and hit the edge of the screen, the lock is lost, and hitting + or - just makes you look at the next unit and not jump to it.
What I'd like to be able to do is hit a key combination and be able to keep the unit centered and locked no matter what I do with the mouse so if I mistakenly move the mouse too far down to say the control panel and over shoot and hit the edge of the screen, the view does not move backwards, it just moves say upward as if I were looking toward the sky, or if the mouse goes to far left or right it would only pan left or right, not slide horizontally.
That way the immersion factor is not broken by mistakenly moving the mouse too far and having to reset the POV with TAB again.