BTW: I asked the same question over on the SVX forums:
http://www.subaru-svx.net/forum/showthread.php?t=28956
I'm not really getting too much feedback... at least not much of anything w/ some reasoning behind it. According to the few replies over there, the stock struts aren't useful for springs beyond 200lb/in. 'Course no one says what happens... I'm assuming the car is bouncy due to under-damping, and the struts probably die quickly.