A setting for "is weightless" for any object or makerpen object would be nice to have. This would essentially cause the object to not respond to any gravity. If left alone, it stays in space. If something collides with it, it will drift off in the direction it was hit from. Some default drag would also be nice so it doesn't endlessly drift away.
This is already very easily done in Unity. It would be great to see this option added to objects in a future update!