I just don't trust the stability of command blocks, and I never really saw the point in them, other than as teleporters, when you have perfectly legitimate methods of doing everything it does anyways.
There are some interesting things you can do with them -- switching on and off mob spawning when an area demands it or to trick players into not dropping torches, adding checkpoint-like behavior, WirelessRedstone-like behavior without involving Wireless Redstone, simple announcements, or even fire/rain judo -- but they're probably not the most relevant thing for most builds.
Or instead of command blocks you could use DimDoors. Not sure if you can disable the crafting for dimdoors...
You can, and it's probably the most map-maker friendly option for user teleportation as a result. Still potential issues if people /break/ the doors, though.
Not likely thematically appropriate for Shneeky's use, though.
Another thing: are there any mods that add armour that isn't totally OP? I can't think of any, besides twilight forest armours.
Thaumium Armor (albeit permission-restricted) and Mekanism's various armor sets are pretty decent, but not terribly strong. Alternatively, MMMPowerSuits, either with no Emeralds or with the Tinker Station disabled, can be a lot more easily balanced.