The space is tight, it would be more difficult that it was to remove, but not impossible. I was hesitant because the first day I had it off I was in traffic and the pedal was so stiff that I almost reinstalled the spring, but now I love it.
The soft spot at the top of the clutch is normal. @
Slysdexia covered it. Also, the master cylinder has a pin-hole that leads to the reservoir. With the clutch pedal up, the pin hole is open and fluid can equalize between the reservoir and the clutch lines. As you depress it, the pin hole closes and the line is able to pressurize itself. If it didn't have this "breather hole" to the reservoir, then as the clutch line warmed up the fluid would expand and your engagement point would change not to mention it would ride the clutch.
Sent from my GS4