I’d add a distinct point on that as corollary #7 suggest “safe mode” beeing strongly linked with rule #7 what is IMHO not good as it should be a general advice.
However it’s your list so you decide >
I am a bit dubious on this one, the present Rules are (in my perverted mind) recommendations to avoid common errors, not suggestions on how to make anyway the errors and get away with them.
In the context of not locking oneself out it makes sense to mention that changes are immediate as a further warning, in the more general way Safe Mode belongs IMHO to the other GP and CSA list.
EDIT: Added in http://forum.mikrotik.com/t/gp-csa-for-mikrotik-devices/182176/1 as point #20 with (hopefully) a balanced view between the two extremes.