There is not, but even if you had the separate GCU, I still don't believe there is a setting in the H3-2D Assistant to adjust the hibernate/sleep parameters. The Zenmuse is a videography gimbal, after all -- it was designed with the assumption that someone shooting video is going to fly as stable as possible with careful control inputs. Aggressive/sport flying is more the realm of FPV, for which you probably don't need/want a gimbal.
The challenge of course is that often you may want to mix both styles of flying in a single flight -- and that's where the Zenmuse is likely to shut down on you. To be fair, it should only take a short nap if you exceed the design parameters briefly; it won't completely hibernate until it's gone way past the limits for a few seconds.
