i study everything to do with cars. look u can decide not to
clutch in when u shift out of a gear, but there is definately going
to be wear and tear on gearbox components.
when u're trying to shift a cog from one cog to another, the idea
is that they shouldn't be moving at all, or more pratically, moving
at very low speeds. When engineers design something and ask u to
operate it in a certain way, its always for a reason. U can choose
not to listen to the engineers at your own risk, but I'll point out
that the space shuttle Challenger disaster happened because they
did not listen to the engineers.