You can use a script with the Reset function to set up defaults:
function Reset () {
rigidbody.useGravity = false;
}
@script RequireComponent(Rigidbody);
When you add that script to an object that doesn't have a rigidbody, one will be added, and the gravity is turned off at the same time. If an object already has a rigidbody, adding the script will turn gravity off. Also gravity is turned off if you choose the Reset context menu item.
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