On Wed, 20 Jan 2010 12:07:58 +0100, Patrick Renkens said:

> This might look like a weird question but I like to ask it anyway.

Yes, it is a weird question. ;)

> Is there a way to prevent listwoners from adding additional subscribers,
> but still let them change other options?

Are you able to discuss the business case here?  What's the situation and
why are you trying to do this?  Maybe there's other approaches that will
be a better fit...