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I'd try bleeding the clutch hydraulics first. Take my advice, use a power bleeder. If you try to bleed it by pumping the pedal, you may not get any pressure back; that happened to me in my E90. With my Z4 I pressure bled the brakes and clutch all at one time.
I've owned BMWs for 30 years and 850,000 miles (4 cars total), all manuals, never lost either a master or slave cylinder, so I'd say it's a rare event. If you are going to replace the hydraulics, just start with the slave cylinder, it takes 30 minutes to change out including bleeding. Maybe the throwout bearing is bad... or the throwout bearing guide.
My 2 cents.
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A manual transmission can be set to "comfort", "sport", and "track" modes simply by the technique and speed at which you shift it; it doesn't need "modes", modes are for manumatics that try to behave like a real 3-pedal manual transmission. If you can money-shift it, it's a manual transmission. "Yeah, but NO ONE puts an automatic trans shift knob on a manual transmission."
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