Why don't you just use two accounts with one browser?
Normal and incognito.
Of course. You could've just tried it
. Oh, and if you're asking if it's allowed, the answer is also yes.
When will this rule change?
IMO it should only be allowed to specific users but it is hard to stop users from using two accounts. Even if it is hard, it shouldn't be allowed and some measures should be taken.
~~MZ~