i don't think that's a good idea
Berserk - Game Timing
Yeah, seems unlikely, but it would be great if they added an option for time odds when playing friends.

In my opinion, I can't see the site adding something that will skew ratings like that.
I agree about ratings.
However, tournament points in Arena adds an interesting component. Needless to say, the idea exists elsewhere (another site).

You definitely shouldn't lose more points for losing a game when you start with less time, but you should definitely gain more (and your opponent should lose more for not being able to win with more time)

would be broken -- especially considering this situation.
I'm a 1800-1900 player in blitz. Let's say I played a 1300 in 5 min blitz and activated your so-called 'berserk mode', which cut my original time to 2.5 min. Given the large rating point difference, it would still be very likely that I would win the game. Without berserk mode, I would gain 0 rating points because of the large rating point difference. With berserk mode, I would gain 10 rating points 90-95% of the time, which would be very broken.
I agree with what others have said, though. With unrated it could be cool.
Can there be a berserk option to cut your time in half and to gain 10 more points on to your rating as extra if you win and to subtract also 10 points from your rating if you lose.