Questions about generating keys

[Oskar L.]

I'm about to generate a new keypair, and got a few questions.

I have many e-mail addresses and change them frequently, and therefore I
don't want to have one in my public key. (Also because I'm afraid of
getting spam.) I think this would be easier than having to update a lot of
user IDs. Are there any any drawbacks in not having an e-mail address in
the public key? Are there any widely used applications that will expect
one, and not work if none is found?

Why is there no way to generate a RSA keypair in one step, like when you
create a DSA/Elgamal keypair? Why do I first have to create a signing key,
and then in a separate step create an encryption key? This is annoying.

"Name must be at least 5 characters long"
Why? There are probably many people who like to go only by their first
name, and have a 3 or 4 character name.

Is there any way to manually set the time that will be used for the
creation time? Or do I have to change the system time if I don't want to
use the current time? I'm a bit of a perfectionist, and think 00:00:00
looks much better than something like 01:42:57.

Oskar