autosubcribe new members on Subscribe by Email

Is it possible to autosubcribe new members on Subscribe by Email to mailing list like it is done on on the automessage plugin. I really like the option to select categorys on the Subscription page on Subscribe by Email. But the site I am buliding only have logged in members, and I dont want them to write their mail one more time to subscribe to the categorys..
Is there a way to auto subscribe new members in the Subscribe by Email plugin?
Can you use both plugins and direct members to the Subscribe by Email plugin Subscription page after they have recived the personal welcome mail from the automessage plugin?