key generation: paranoia mode - explicit random input

[Robert J. Hansen]

> Probably. But this is not a proposal for "users" but for the kind of 
> people who regularly write on this list. People who know what they are 
> doing.

That, by itself, is a compelling reason not to do it.

A feature that will be used by under 0.1% of the userbase is a feature
not worth introducing.  The likelihood of introducing a bug which may
affect everyone is orders of magnitude greater than the limited benefit
that will be enjoyed by one user in a thousand.