Here is another factor to take into account: does your game feature starve timers?
At my last university, games ran for one week and a zombie would starve if they went more then 48 hours between kills (or assists). It was quite common for the vast bulk of the noob players to turn early in the game, and for large numbers of zombies (including some experienced zombies) to starve mid-game because all of the easy prey had been taken.
If Mr. Deploy is a noob, it may be a good idea to leave him alive just so that you can nab him later, when you need the feed.
Human A [...] doesn't present anything but a classical threat, and most important, this type of player is almost certainly a career human who is an incompetent zombie.
Good post, but I have to disagree on this one point. In my experience, skilled/experienced human players also tend to be skilled/experienced zombie players. Many of the skills required to excel on either side are also useful for the other, and people who have played enough games of HvZ to be experienced as a human will almost certainly have plenty of experience as a zombie, too.
On the other hand, there are players who only want to play as a human, and who will throw a snit when turned. They aren't necessarily incompetent
zombies, but they are still bad
zombies because of this attitude problem. In my experience, such players are fortunately rare, but from what I've read on this forum they seem to be more common in other games.
So, this could go either way, depending on the player (or, if you don't know the player, on the general attitude towards zombies in your game).
1. I want to be a better zombie, and I have found myself on both sides of the fence--tag the biggest weapon/tag the best potential zombie/tag the easiest for more numbers.
This, like many things in life, is an optimization problem which becomes intractably complex when you attempt to account for all relevant factors. Given that this a decision which is typically made in a split second, it's probably best to follow a simple decision-making algorithm. In most situations, it will be obvious which human you want to tag. Otherwise, if the values of a set of available targets are close enough that it is difficult to identify the optimal target, then their values are close enough that identifying the optimal target is not very important. It is better to quickly identify a good target than to identify an optimal target too late.
2. I want to start customizing my load out to appear less desirable to zombies (I'm actually really excited about this part).
Ooh, interesting. Most people try to look as intimidating as they can, or try to not be noticed, if they care about their appearance at all. I've never heard of anyone trying to look like a human player, but one who isn't worth tagging.
Unfortunately, there won't be a simple way to do this, if it can work at all. At best this will be a difficult strategy to pull off, as you will need to anticipate what the zombies in your game desire. You'll need to pull a Batman gambit against the entire horde. At worst, changing your appearance will merely cause different zombies to target you for a different set of reasons.