Could you explain this feature a little more? I've recently become a rsm fan and just snagged a cutlass mark 5.1 off of the classies.
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Ahoy! The 5.1 models come with two switches on the bottom. The outermost switch (am I remembering this right guys?) is a simple on/off switch, the inner switch when in the down position (when looking at the bottom) is the VV position and the regulator is in-line with the voltage display and atomizer. When in the UP position, the mod bypasses the regulator and applies true battery voltage (up to 8.4 volts) to the display (and atomizer if it's still screwed in).
This was meant to enable the owner to check his battery levels and also to replace the dual batteries with a single 3.7v 18650 battery if desired.