What I'd like to see:
At least an option in the contacts section like
the "user wants html mail" flag for encryption:
"user wants encrypted mail".

Best would be an option in "Security" like "send
encrypted if key available" that would evo make
have a look into my keyring and send an encrypted
mail if I have a key corresponding to the email
address.

This would make gpg mailing far more comfortable,
as you don't have to remember the people which got
keys and which don't.