Snagged this yesterday and I also have a tribute SB-2 (Which i wish had a tone control)
and since we are talking cabs I love love love my Mesa PH 2x12's
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I've had many American SB-2, and I could never fully embrace the tone for my tastes, but toward the end of my stint with them, I noticed that they sounded much better through my Orange AD200 tube head, than they did through my solid state Markbass stuff.
As a long time precision guy, something was missing, and I personally found the bridge pup to serve little or no purpose... I did every electronics mod imaginable, starting with the tone control, and I never found anything that got it close to my precision tone.
I never touch my tone knob, meaning I'm full treble, the organic sound of the instrument at all times, so adding a tone pot in the SB-2 was pretty useless, since all it could do was take away bass.
If you have an SB2 and love the sound, then just tinker with your amp to perfect it. Adding the tone knob can only remove a little treble, which is so easy to do on the amp.
However, it's an easy mod to do if your set on doing so. Just stack the two pups on one pot and put a tone pot wher the bridge pup vol was.
If I got an SB2 again, I'd stack the pup volumes on the neck pot and add a Fender TBX where the bridge pup pot was. That would give the widest array of tonal options from the bass, and possibly have provided what I couldn't find in it.