Hi Folks,
Probably old news for some but multitouch is available for the Spica. Leshak has incorporated it in his kitchen here:
http://forum.samdroid.net/f28/samdroidmod-kitchen-v-2-all-one-samsung-spica-i5700-en-1901/
If you need a guide to root the Spica that is available here:
http://www.addictivetips.com/mobile/root-samsung-galaxy-spica-i5700-with-leshaks-kernel/
I am running LK 2.09.4.
Cheers, Matt.