Question about moderating individuals.

I want all users who subscribe to a list (from now on) to not be allowed 
to post. i.e. they should be moderated by me. After I determine that they 
know what they're doing I'll clear them for posting.

My current scheme is

configset xxx access_rules <<ENDAAC

post
consult, reason="Address is in the badguys list."
@badguys

ENDAAC

So first choice is: How do people who subscribe to xxx also automagically 
get added to xxx:badguys?

I'd rather do this that use postblock since I can keep track of all the 
moderated people easier that way.

TIA

-- 
Time flies like the wind. Fruit flies like a banana. Stranger things have  .0.
happened but none stranger than this. Does your driver's license say Organ ..0
Donor?Black holes are where God divided by zero. Listen to me! We are all- 000
individuals! What if this weren't a hypothetical question?
steveo at syslang.net