Yes. You can map only 1 biotic or special power to one button. When you hold the RB button down, it will bring up that menu and tell you which button you can use. I can't remember which one 'cause I don't use this feature.
You hold RB and move the cursor to the power you want to map... then you press x... then you can just tap the RB and you will cast the mapped Biotic...
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