After performing the fix outlined in this thread:
http://www.subaru-svx.net/forum/showthread.php?t=27339
...I started the car a few times to make sure the new ignition switch did in fact solve my problem. Then I turned the lights on and, on a whim, hit the turn signals.
There was still a very slight dim, but it was slight like the hazards used to be before. So somehow, replacing the ignition switch has improved my electrical performance. I have no clue what exactly it was, but things seem to be working normally now. They aren't painfully obvious at least.
Now if only I could find the darn rubber seal for the key cylinder...
