[Suicide Junkie]

Yep. In fact, I custom built my LAN Helper for SEIK, and wasn't really concerned about simul play.
He just needed a program to identify new game files, and start SE4 automatically when they arrived.

SEIK: If you don't see any mention of a fix in the next patch, you may want to send a reminder.
Also, another idea for you:
Try setting your path.txt to your opponent's SE4 folder (mapped to a network drive). Then, your default savegame folder should be right where you want it to be.