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I've messed about with this kind of alt on UFI and here's what I found:
1. The alternator monitors charge acceptance, not just voltage (voltage can't tell you much frankly). If you fit a LiFe or supercap, you'll change charge acceptance and the alternator will become confused. I often had to stop and reset the system as it would go into safe mode (constant 14.0V). S/S was never going to work as again, charge acceptance was too high as judged by the ECU.
2. Disconnecting the alt is all but pointless. Essentially (assuming you have a serpentine belt), it's already free spinning much of the time so removing it and fitting an idler pulley won't help.
3. Charge the battery every night. You'll get a solid 5% gain as essentially the alt is now off because the battery is full. It will still ramp up on overrun for some free charging.
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