I've been messing around with CVARs and Commands for the Half-Life Dreamcast.

Here is a few neat things:

The framerate is locked at 66fps, you can raise the framerate

fps_single 100

That sets the frame-rate to 100

Interesting enough these two commands are also implemented.

fps_modem

fps_lan

There defaults are 66 as well.

These are also there.

deathmatch
coop
skill
port
clientport
fakelag
sv_lan

The default for port is 27015
The default for clientport is 27005

You can also change the autoaim with:

sv_aim

The default for sv_aim is 0.900

There are so many cool things:

sv_bounce
sv_airmove
sv_stepsize
sv_accelerate
sv_maxspeed
sv_stopspeed
edgefriction
sv_friction
sv_Gravity
sv_newunit
violance_agibs
violence_hgibs
violence_ablood
violence_hblood
sv_language

Nearly all of the pc commands are in the Dreamcast version!!!