My b2evolution Version: Not Entered

Hey,

I've installed b2evo and want to share it with some people. Everyone should get his own blog and his own subdomain. Not a problem at all, everything works fine.

But I would be bad if an user has to login in every blog to add comments - why not one login for every blog. But how to create this? Cookie-Domain and the Subdomain has to be the same.

Any ideas?