I would like to be able to assign a task to a person, without having to enter mail address or the person even being aware of it.

I know I can use the "contexts", but I do not want to:
- with a large number of "contexts" for contact persons, that will seriously clutter up my screen
- when a task is "tagged", that still does not constitute a real "assignment". For example I can tag "@mother" to the task of "buy birthday present", but assign the task to my "father" instead.

For this reason, I would appreciate a way to add contacts without them having to confirm anything or entering their e-mail. Or perhaps a way to "group" contexts together that have contact information in them.