Fender forum member MusicLaw did some digging and rehashed some of the most helpful threads from the Fender Forums.  I intend to better integrate the significant content from these threads into the Wiki, but in the mean time...

Fender Mustang Controls and FUSE

How to Get "Light Distortion"

Playing Multiple Mustangs

Mustang Set-Up Advice

Precision Movement of Controls in FUSE

"Fizz" on a v2

Caster Wheels for Mustang IV (v2) Amp