Theoretically, yes you can

All some gods have do is create a new superlogin or alldomainslogin page, which upon successfull login presents an iframe for each available permutation to set a cookie, and then you've got a cookie for all of them

In the same spirit of having gods fixit, there is Re^2: Perlmonks 'Not logged in Error' - Proposal for fix (autocorrect perlmonks linking shortcuts in preview )