Hi,
You should fully depress the clutch every time. This allows for all the various parts to travel their full throw and prevent corrosion or dry spots.
Also, the floor acts as a stop so you know it's fully depressed. Your foot is not so sensitive as to be able to gauge exactly halfway each and every time and you'll surely increase the wear to the machine over time.
Finally, it's just generally a Bad Habit and you should concentrate on developing Good Habits to increase your driving skill and preserve your machinery. You might shift like this for years with no problem, but if Porsche wanted you to, they'd have put a stop at the halfway point. Also, I will not ever promote or recommend adopting Bad Habits in Driving.
Happy Motoring!... Jim'99
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