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I tried the berserk option once to test if I can handle the one sided time pressure. In this tournament it did not change the end results but I have seen tournaments where results changed in both ways because of using the berserk option. In general it is a high risk to use the berserk option if you play a fast player.

The simpler the better. At the moment there is no opportunity to disable Arena Berserk when tournament is created. Plans for future are to start tournament with rating limitation so all players can have chances to win, and it will be difficult to play berserk with strong players. I guess middle players and beginners will rarely use it as time control 7+2 is rather short.