Did a little sideloading and messed around with the governor but I don't really know what I'm doing with that. Side loading wise, got Doom 3 BFG running, sound stuttered terribly but visually it seemed to have a good framerate so who knows.
Installed "no frills cpu control" to mess around with governor / performance settings but either I don't know what I'm doing or it had some issues. It only has one option listed for the I/O scheduler "noop", and it seems to be misreporting the min and max clock frequency. I guess that has more to do with the s192 than any adjustments on your end of things tho.
update: Spent a little more time with doom and had the same sound issue with the original and doom 2 that come with BFG. And, kinda funny, it automatically loaded up my savegame on doom 3 from when I was playing it on the shield tablet. Amazing world we live in.