When it comes to Surgebinding FTL, I wouldn't use Gravitation for wormholes. I would use Gravitation for basic movement. For actual FTL, I would use the Surge of Transportation. I don't know the exact way the Oathgates use it, but seeing that it can also be used to transport people into the Cognitive Realm, I would propose using it as a form of hyper-drive, transporting a spaceship into the Cognitive, and exiting at the destination.
As for my own ideas, using Breath to awaken a computer, creating sentient machines.