FWIW, the new beta is able to go quicker. But right now it's just a beta. So the addons like "sound" don't work.
In the beta there is a setting under "Extra/Debugging options/fixed time steps. The description for this is...
"This option assigns a fixed simulation time interval to each frame. Useful for debugging, and when numerical accuracy and stability of the dynamic propagators are important (for example, to generate trajectory data or when recording high-fidelity playbacks).
Warning: Selecting this option leads to nonlinear time flow and a simulation that is no longer real-time."
Anyway, I found that on my laptop with the default value of 1 second for the fixed time step length (per frame) it tends to run at about 50 times faster than real time with warp set at 1. So warping 0.1 it's still 5 times faster than real making it tough to control. But by changing the value of the fixed time step to something like 0.5, at warp 0.1 it can have the sim running on average 2.5 times real time making it at least controllable for atmospheric flight and for doing TransX maneuvers. So warping from 0.1 to 100,000 makes it in effect 25 times faster than real time at warp 100,000. I am loving this feature as it allows what used to be a 90 wait for trips to the outer planets, to be done in just 3 or 4 minutes. Now orbiter in the outers is no longer a waiting game. Sure it has no ability to do pure real time but time is just relative anyway, right?