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Removing the stop could affect your warranty. I would instead remove the the plastic ring that engages with the stop. The knob would be able to rotate the entire elevation range, and there would be no zero stop. I would save the ring to restore the zero stop if needed. The long term effects of recoil on the BT knob with this ring removed are unknown. Do this mod at your own risk.
Disassembling the BT knob takes some care. You have to pinch the fingers on the top of the spindle to remove the inner cap. You can break the top of the spindle if you squeeze the fingers too far. Using a sharp tool can damage the spindle as well. If you are not very mechanically inclined, don't try it. I made a tool to pinch the spindle fingers just enough to free the inner cap. Basically, smooth jaw needle nose pliers with a stop.