I thought all the newer Mustangs with cable clutches had throw out bearings that were engaged all the time....it is a function of keeping the cable correctly adjusted.
On the 03/04 Cobras, that's how it is, and most all of them experience early TOB failure before 30,000 miles (famous TOB/retainer sleeve squeal). There is supposed to be slack in in the cable to allow the fork/TOB to "float" and prevent pressure plate contact, because as you tighten the cable it begins to pull the fork forward. The correct way to fix it is with a preload spring between the fork and the bellhousing. Then you can take all the cable slack out of the pedal and have immediate clutch engagement with no dead space in the pedal, while the spring keeps the cable tight and prevents it from relaxing under rest tension and tugging on the fork when you get it nice and tight.
The other culprit is the junk stock plastic ratchet style adjuster that wears and loses adjustment easily, especially as the clutch wears and exceeds it's adjustment range. It's best to go with a aftermarket quadrant and firewall adjuster, and "freeplay correction kit" (aka spring between bellhousing and fork). Keeps your clutch pedal nice and firm while also prolonging TOB life by keeping it clear of the PP when not in use.
The S197 uses a hydraulic TOB, and thus doesn't have the problem with having to fight cable tension to keep the TOB clear (the return spring in the hydraulic system pulls it clear).