Well, as Helyna said, you can always register for a second account. And I suppose, if you think you're predisposed to having a breakdown, you could plan ahead and re-register in advance, so that another account is there if you need it.
The limits were probably put there to prevent someone from registering under the name "Buy_My_Book" or something like that, and then "responding" to every thread. That would be pretty darn annoying if you ask me. Even if you don't ask me, I think it would be annoying anyway.