you'd be happy to chase a ship around the board even killing one and they kill nothing of yours and you lose?
I didn't lose nothing, I lost half a Falcon. And the game sounds boring as hell, but that's a problem under any scoring system.
Under the current rules this kind of feat would be near impossible to pull of as you would have to stay engaged with the Z's to kill of 1 or 2 while maintaining the integrity of your ships. With a Partial Point System this would become more frequent and the frustration of playing competitive games would drive people away from it.
I do have to say that if your only argument for such a Partial Point System needs extreme examples to justify it, you may need to reconsider if that is really what you want.
Lets add theme to your example. Lets say the whole time Han is fighting off the swarm C-3PO is feverishly working to fix the hyper drive. When the round ends is when the Hyper Drive is fixed and Han escapes. Even though he was praying " hear me girl, hold together" the jump to light speed allots him time to repair the Falcon back to full glory. In the exchange he managed to take out a few ties. This sounds like a win to me for the Falcon.