Ability to register multiple sites with same subdomain in each domain

I would like to ask for a modification, which will allow users to register each subdomain-name as many times as many domains we have entered in Multi-Domains Plugin. Current functionality, which prevents registering same subdomain more than once, even if we have 100 domains to choose, is, let say a little bit stupid... So, what is the whole module for? Not for increasing number of blogs registered in site? Can You imagine what a user is thinking seeing, that the domain is free, but the system says, it is already taken? The user will think I'm stupid, and my service is even more stupid.

Please consider adding this functionality.