Mixed pair of sintered and organic brake pads for disk brakes
Mismatched pads means mismatched braking forces. For the same amount of pressure applied to the rotor (which is how calipers work) one pad will apply more braking force. That will try to twist the caliper. Probably not enough to matter, but it would be annoying to find out that it did  - the caliper would twist, either breaking off the bike or damaging the rotor. I think the former is extremely unlikely.

The other effect is that you'll get differential heating. The more effective pad will generate more heat, and heat up one side of the rotor more than the other. Since rotors are thin this will be a small effect, but since they're thin it doesn't take much work to warp the rotor. This is actually fairly likely IMO, and it's something I'd watch carefully for while testing the setup before committing to it.

I'm not sure you'd get a lot of benefit except in extreme conditions. My experience of disk brakes over the last 15 years) is that I can tell the difference between cheap cable disk brakes and expensive hydraulic ones, but other than that they're pretty much of a muchness.

This will be even more true on a road bike where you don't have as much traction as a bike with wider tyres and more tread. You might actually be better off with "less effective" pads because you'll get better modulation.