When I went faucet/shower fixture shopping a few years ago, the most sensible shower thermostat I've seen is a single dial that goes counter-clockwise from 6 o'clock to 9 o'clock, with the ideal temperature being somewhere around 12 o'clock. It's not possible to get low-pressure hot water with this dial but I don't find that to be necessary. The shower thermostats with two knobs are too hard to use as changing the temperature requires a balancing act between the two knobs and the area around the hot water knob is usually scathing hot (the hot water flows right behind it).

I have no idea why everybody doesn't switch to these kinds of shower thermostats.