You can buy those moist absorbent balls for near nothing. Rodents will eat through cardboard but most likely not through plastic. If you want to be completely sure, encase it in aluminium wrap too. Aluminium wrap is very painful to chew through.
The CPU might also be good to take out as it is also prone to nearly everything. Take out as much as you can, but the CPU, graphics card, RAM and HDD should be enough. (Please note that I am not a professional and cannot be held responsible if anything goes wrong)
Even though the case is fully...
Why would you only want to take out the graphics card?
If the computers are going to stand somewhere humid it might be a good idea to take out most of the hardware, or at least let it dry thoroughly before you try to use it again.
I would recommend finding somewhere completely dry to store...
Keep in mind this is only an early alpha. Also, regarding 3, I think they use it as a convenient way of going around infinite depth. Bottom of the island = death by fall. Also, they will probably add more terrain types later on.
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I think he is trying to have two mice plugged in at once, and have one "left-handed" and one "right-handed" with their buttons.
If you are using a Logitech mouse I believe their SetPoint software can be used to reverse the settings for one mouse.