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I think I accidentally discovered a trick to minimizing synchronizer wear when bump starting- hold the clutch in for a few seconds while in neutral before putting the trans back in gear. It seems to go back into gear with less resistance that way.
I think what's happening is having the clutch disk disengaged lets it and the input shaft spin up a bit so the synchro of your chosen gear has less work to do to bring it back up to engine speed. Even in neutral, the input and output sides of the transmission will still have a slight connection through the bearings and oil, which is why many cars will spin the wheels when running in neutral while jacked up.
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