The "nanny" function cuts the total output power to prevent damage to the units..Only trips under extreme circumstance like a speaker short, or if the unit ends up in Amir's house.
The web function is highly useful for saving and loading different room correction curves to/from file for easy comparison.
My guess is the internal memory used by these AVR's isn't big enough for that function.
And just for fun, there are many other settings you just don't get on the unit itself...probably also related to memory limitations.