Can a customer select from System Tracking Domains?


What's the meaning of "Can select tracking domains for campaigns" in Settings .> Customers > Domains?
I have set YES this setting. I have set System Tracking Domain, too. But there is nothing to chose in
Campaign options > Tracking domain.
@Arta - Tracking domains in the campaigns area must be owned by the customer as far as i can see.
Maybe we should also allow global tracking domains as well though...?
@twisted1919 Listing and making available a couple of tracking domains can impress the customers.
Further more, I have noticed that tracking domains have impact in campaign performance.
I think that is a good idea if customer can play with system tracking domains.

If a customer can add tracking domains, it is implicit that he can chose tracking domain. In this situation, the setting "Can select tracking domains for campaigns" is unnecessary.