Different keyboard manufacturers have a selected range of keys that their keyboards can type, which will probably get confusing:
"Only hp unicode keyboards have the print symbol. For other unicode keyboards or ASCII keyboards, type alt-8713 to get the print symbol."

A diode maintains a one way flow of current.

FB requires your current password to change your password.
And goatse harms people otherwise uninvolved.

Don't forget the recharger, which might be expensive or inefficient.
The manufacturing process could also pose a problem, it might require plenty of energy and/or release waste.

However people can still leave their routers on while they sleep/are at home.
But of course the signal would be weaker.

Couldn't it be possible to have a botnet upgrade into different versions, allowing it to split?

Clarification:
Virus writer releases virus A and sets up control server A.
Botnet A gets large, and the writer is worried about authorities, so he sets up servers B and C, as well as writing two updates.
Botnet A gets update B or update C from control server A.
The update installs the new virus and removes the old one.
Botnet B gets large, virus writter sets up servers D and F.
Process continues.

If it's split before the AVs pay any considerable attention(or if you split enough to confuse them), a writer could write a fast spreading botnet, without having to worry about it getting too large.

I would imagine that setting up new servers and updates might be a hassle though.