If it is, I wonder if we could use it as a gravity slingshot to "fire" interstellar probes at incredible velocities? Imagine the Oberth effect kick you'd get fr

If it is, I wonder if we could use it as a gravity slingshot to "fire" interstellar probes at incredible velocities? Imagine the Oberth effect kick you'd get from that! They'd never be able to slow down but they could do flyby missions of extrasolar planets, etc. In the much further future maybe it could fling interstellar spacecraft that carry enough propellant to slow down. Basically you'd get the acceleration for free and just have to decelerate at the end. That black hole could be our Stargate, though in a less sexy way than the movies. :)