Recently while discussing the Anonymous Question feature with sdstuber the idea of being able to ask a question of a specific white-list of Experts was brought up.
The idea is that certain Experts have helped an asker multiple times in the past and they would like to have a semi-private conversation with just those Experts.
From the originator of the idea
The goal (at least as I intended) is not to use blacklists, but to whitelist questions.
Part of that is a community oriented spin. That is, it's a feature about those we like, not those we hate.
Also, functionally, if you're asking a question and you have some favorite experts you want to ask, you can't blacklist every single other member. Even if you did do it, somebody new could always create an account 1 second later and hop in to your question.
I assume users will be able to build a few saved white-lists, there by making it easier to pull up the favorite experts for various TAs
The lack of saved lists wouldn't be a show stopper, but seems like a useful part of the feature.
Messaging takes the question out of the point system and the end result doesn't become part of the PAQ. These would still be questions with all the features thereof, the only difference would be only some people could post in them. I was envisioning the question would be invisible to members not on the white list (see below.)
There is a potential for some favorite experts to get points they wouldn't necessarily have gotten if they had to share with the masses.
However, any expert that is on a Question's whitelist, is presumedly fairly active, helpful, quick, and polite. So there is a good chance that even if there were other people involved, that person (or those persons) would likely get the lion's share of points any way.
I think this would be a premium service, so there will still always be other questions available that are open to everyone, also not every question will likely be asked on a whitelist (I wouldn't make it a default option.)
Plus, just because an asker selects experts x,y, and z only, doesn't mean they are available right then, or know the answer, or even noticed that particular question amidst all the others. So, I would envision an option to open (irreversibly) a white-listed question where the favorites fail to produce an adequate answer. At that point the entire thread opens up to the rest of the world, being both visible and postable.
Also, once the question is closed it would then become visible as well and, I would think postable.
This discussion is to address the possible pros and cons in a constructive fashion.