Haha, not quite holy. More like "holey." Intentionally, sort of, because it only includes the fundamentals plus anything mechanically important that is difficult to otherwise discern through normal play.
There is nothing about stacking in the manual. If the utility says its effect <stacks>, it does, otherwise most likely not. (Though as some have found with various utilities, there are a few that can operate in parallel, which will become clearer with a planned description update.) I figured it wasn't necessary to explicitly state <no stacking> if all those that do stack are marked, but maybe I should make it explicit just to avoid confusion?
@Eloden: The basic ones are okay, but not amazing. Find the experimental variety for ultimate protection, or that combined with other mods to make yourself extremely hard to hit.