Check this out! A guy from UKLegacy alerted me to it. A nice diagnostics and datalogging program for Windows that supposedly works with the SVX and other Subarus.
Unfortunately it's not free, but it is cheap. I haven't tried it yet, but I certainly plan to have a look at it.
http://www.limitless.co.nz/
I can't help wondering if they borrowed some of our research for this. I don't see how else they could find the memory locations for the SVX without having access to an SVX to experiment with.
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Subaru ECU and TCU Website
1992 Alcyone SVX Version L
1992 Alcyone SVX Version L
1994 Alcyone SVX S40-II
2004 Subaru Legacy 2.5 SE Sports Tourer
1996 Subaru Legacy 2.2 GX Wagon
1988 Subaru Justy J12 SL-II