http://planetside.station.sony.com/c...fr_origins.jsp
Looks like just fiction / background to me, I don't see any gameplay info posted, but then again I just skimmed it and then came to report in.
[Edit:
Alright, summary: After staying in the caverns long enough, resonance crystals begin to understand your mindset and how you act. Once given an implant at the top of your spine, you can finally drive the BFR without having to deal with operating every single joint, arm, and finger, letting the crystal's emotional "database" deal with the minor details.
However, this crystal often lets pilots feel hate, anger, pain, and other emotions from their BFRs. They often feel this even when removed from the BFR cockpit.
I think this kinda implies that we need an implant to pilot them, which we qualify for with attuning.]