Thom,
Yes, the sail could be furled. But to do so will greatly shorten the life of the spinnaker cloth. The initial turns of cloth will be very very tight about the luff tape and this will wade and twist and stretch the light weight spinnaker cloth. The bottom spool is going to make several turns before the top rotor ever makes the first turn, OUCH!!! I don't need to ruin a good spinnaker just to roller furl it.
Bill