Often times when I defeat a fleet I would take more cargo than my fleet can hold safely because I know that the supply usage would be quite high due to the recovery and repair period after a battle, thereby cargo capacity would return to normal levels after recovery is finished due to the used up supplies.
I've just been wondering, what do you guys think about risk of accidents being lower when your fleet is "staying still" or otherwise not using their engines? Because that would mesh quite nicely with the above method.