Hacking the works inside a modern camera is not simple. No one outside the inner circle has access to the schematic and uncomplied firmware.
Unlike an automobile, where shade tree mechanic has an idea of how to wring more power. And this power comes as the expense of fuel consumption and moving part wear and tear.
A home computer hack is in boosting the operating frequency. More heat is given out, so, a secondary market of various cooling aids are made for booster to use. That has no real benefit in the long run, I can earn a sword faster in game play.
Look at Virginia Tech: in 2003, it set out to build the first super parallel computer, at an unheard of low budget. All using off the shelf, un-mod apple G5s, all 1100 units, (did cause said computers a shortage on the market for a while. And it shock the apple sales managers). They got placed third in the Top500list.
In less than a year, everyone went in the game, and it never recovered. This kind of hacking requires software know how, not even digging into the hardware, where, general knowledge is known to the computer scientist.
Now, if I knew how to improve a modern camera performance by 10%, I'll work for the best camera company, at what I want them to pay me. Thank you very much.
So, I also wish you're able to supercharge your 1DXX-v4.