I wouldn't worry about it with hand or pc usage.
Taping off panel edges is used to avoid excessive paint leveling when using the rotary. Anywhere the paint is curved or comes to "a point," the paint is more susceptible. For example, if you were compounding the trunklid using a rotary, you would tape off the rear quarter panels on each side so that the edge (of the quarter panel) would not build up excessive heat.