The problem I had noticed with ATF is that it does not stay suspended in the fuel.Not a big deal if you are riding the bike frequently,but not much help over the winter.Perhaps for storage two stroke oil would be better.
I wash and wax the bikes,fill the tanks,add an ethenal guard,drain or run out the carbs,charge and remove the batterys,change the oil,overfill the tires 5lbs,lube chains,drsin the breather catch and cover them up in the corner and don't touch them tell spring.
Unless ofcourse its the lucky bike that gets all my attention through the winter.Then it gets stripped beyound recognition and repaired/improved/updated or just plain changed.