mml-secure: function doubled, passwd chache, use-my-public key

[Uwe Brauer <oub@mat.ucm.es>]

Hello

I just started to use mml together with gnupg, so far I have used
pgp2.6.x with mail-crypt.
I would appreciate if somebody could clarify the following points:

    - what is the difference between the following functions
      Possible completions are:
      mml-secure-message-sign-pgp
      and
      mml-secure-sign-pgp            

      mml-secure-message-sign-pgpauto
      and
      mml-secure-sign-pgpauto        
      the documentation is not very helpful

    - all  the time  I  sign, encrypt or   decrypt I  am asked my
      password,  could  that be  cached  say  for  5  min  (as in
      mailcrypt)

    - when encrypting, could  may own public  key be used as well
      (this way I can read that encrypted mail myself)


    - is there  now variable  to always sign  a msg  (I could put
      that into a hook I know.)

Thanks 

Uwe Brauer