Can you believe it, I made this six years ago. It needs some changes, though.
http://img339.imageshack.us/img339/2175/phasercarbinefinal3b.jpgAh, but how does this system account for blind firing or when you aren't looking directly at your target. Under this system the phaser wouldn't be able to resolve a target unless you look in the target's general direction. Is the assumption that the phaser would simply fire straight forward? What about when the target is ambiguous? This system also implies that there is some kind of actuator either on the focusing crystal or the whole pre-fire matrix which would align the beam and no schematic of a phaser has ever show such a device. Are you saying phasers have this feature or this is how it might work?
If the weapon were unable to sufficiently angle the shot, or could not determine where you are looking then I assume it would fire straight.
Under this system the phasers doesn't need to recognize targets, it is more like a deadly range finder. It has no idea what it is looking at, but can still derive a distance.
I am saying phasers do have this feature and that it may be a way it works. Phasers have frequently fired off-bore, dramatically so, especially in the early days, but also into the movies.
http://img685.imageshack.us/img685/4733/p2co03.jpghttp://img190.imageshack.us/img190/1980/p2pp10.jpghttp://img254.imageshack.us/img254/6667/phafcriker2.jpghttp://img254.imageshack.us/img254/8271/tng3vengeance14phahit.jpghttp://img685.imageshack.us/img685/3301/tng3vengnoran01sm.jpgIn my mind a target adjustment system like this could be detrimental or unwanted in certain situations unless it was very advanced and capable of dealing with the ambiguities of battle. Just a system which used the tricorder or on-board hardware to either link to a HUD or displayed targeting data directly on the tricorder screen would be more useful; obviously rifles could display targeting data on their sights. If you're using a HUD you could use eye detection to set a target manualy and then have the phaser perform target adjustment to ensure a direct hit.
The worst that can happen with the system I describe is you have the weapon pointed in the general direction of something you don't want shot, and get distracted at the very moment you squeeze the trigger. The off-bore firing has lots of angle but not 90 degrees, the most we've seen is almost 45 degrees which fits with the widest widebeam setting we've seen in Voyager. So, simply keeping the phaser pointed away from things you don't want shot should be enough. Wide beam settings are another point in regard to off-bore firing since both require the ability to scatter the beam without aiming the whole device. But I digress, the point is, the worst that would normally happen is your target moves in between the time it takes to squeeze the trigger and the beam reaching the target, or the phaser's line of sight is blocked while yours is not, or the phaser line of sight suddenly becomes blocked when it previously was not blocked.
Since the beam has never moved after firing, but instead has stayed fixed in relation to the weapon, moving your eyes while the beam is firing is not a danger. Instead, hand movement becomes the risk. Since, in my proposal, the phaser does not make target locks, it cannot target out of control nor unexpectedly.
I would assume the Type II is too small to contain the more advanced and bulky systems capable of being fitted on the Type III variants. Tricorders are about as big as the Type II, bigger considering how small the weapon has become. Instead of multi-target tracking and holographic sights, it uses a relatively simple method that gains better results than any modern system. The mean hit probability of police is only 15%, phasers I think are 25%, not counting training situations which have an improbably high hit ratio given the targets.
http://www.theppsc.org/Staff_Views/Aveni/OIS.pdf