Losing my mind with electrical issues.

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You got wires that dump the cruise on the brake pedal and clutch
Check those harnesses real close and the switches for obvious problems
A good scan tool can see when either of those pedals are depressed? Maybe?
I think my NGS would scratch it
 
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You got one or two grounds above the drivers feet
You got one or two in behind the left kick panel
A Ford EVTM for your car would be a good investment (shows every ground location and has pics)(all the schematics) etc.
I only have one mustang evtm a 1989 I think or I would post pics for you
 
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Cables seem to be fine, cleaned a large majority of the grounds as well. Replaced both cable ends as well. Its something piddly.

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Cables?? The 2002 uses an electronic speedometer with OSS that is run through the PCM. I tried something yesterday on my '02 but didn't do what I thought. Was thinking the fob battery was your issue so I took mine out hoping it would replicate your issue, but it didn't. Still trying to wrap my brain around this.