well, seems like it could cause a problem, but only to the bearings at the outputshaft...not to the whole tranny since it disengages the whole output shaft from the rest of the tranny while its in neutral.

if you are concerneda bout it it... just start the car up if its not busted, and let it idle... the torque converter will pump the fluid thru the whole tranny while it idles, its just not at the sky-high pressure it normally is when you are on the throttle and under load, like accelertion. this will keep it lubed up while the car is being towed.