this is already in the works:
http://www.subsim.com/radioroom/showthread.php?t=125557
until it's done you can edit the sim.cfg located in data\cfg
change this:
[Mech]
Waves amplitude=0.2
Waves attenuation=0.75
into this:
[Mech]
Waves amplitude=0.5
Waves attenuation=0.03
these are the values from SH3 and look much better.
can't remember if there were any side-effects..