One thing you should know about the e-brake, DRL's and brake fluid level. They are all linked. The red "Brake" light will come on under two conditions. One - the e-brake is set, Two - the level in the brake fluid tank goes low (prox switch when float gets low enough). Both of these things will turn off the DRL's. The reason I was told that the DRL's go off with the e-brake is if you are parked in a drive in movie you need to have your lights off and or parked on the side of the road. Some countries you are supposed to have only your "parking lights" on when you are parked and not your headlamps. Which is the reason we have the switch on top of the steering wheel.
details here:
http://www.scoobymods.com/forums/showthread.php?t=1803
As far as how to disable the DRL's, on some scoobies it's as easy as unplugging a resistor by a strut tower in the front. My Forester, is like that. However I think it's harder on the B9. I think you need to unplug something that is behind the glovebox. I never really looked into it because I like having DRL's myself but realize it's really up to the individual.
edit: I just checked the relay wiring diagram and it seems to be up under the dash (I have no idea how far) on the drivers side behind the speedo area I think. Looks like the module has two harnesses plugged into it. Each harness has a fair amount of wires. I'm not sure unplugging the harness would only disable the DRL's it may make other things not function.