Hmm,, Protected start base It should be difficult for people and just because its dangerous. Not for me. But i think 20 seconds its to much. Cuz now the non-lamers can lame with the lamers ( understand XP ) It should be good for a own base where only your own team can enter it. Like this
And you are save on that base. If you want out you got 10 sec for walk out and cannot be killed.
And ?! ?