Here's hoping on the details of #6
Number 14 opens up some interesting possibilities for modders.
I'm assuming for now that the "needs spaceyard" applies to the ability.
By giving other components an emergency propulsion ability of Zero, they will also require a spaceyard.
For example: Lifesupport and/or crew quarters. With this ability, you would have to return to a planet or base, or SYS in order to get your crew restocked.
Also, mods could create "prototype" components. The prototype component would have the abilities of the next tech level up (which you don't have yet), but would have few hitpoints, act as armor (destroyed first) and
be unrepairable.
Using emergency propulsion would destroy this component, too. Since the prototype is highly unstable, it is reasonable that stressing the ship (emerg. propulsion) could critically damage the equipment.