What about the idea of using hda2? It's not doing much else in life..


Benefits of /dev/hda2:
Doesn't get wiped during upgrade (although not guaranteed.)
Distinct location.
Doesn't cause sync issues.

Benefits of /drive0/somewhere:
Huge. (Useful for emptris, or holding many apps)
/dev/hda2 could conceivably be wiped on upgrade (although I'd expect we would be warned beforehand)
Easier to deal with wrt Point&Click installs.