I presume the mention about bearings is for the R1830 Pratt.
My 1,600 hours was on DC3’s with Wright Cyclone R1820’s & 24 hours on C47 over 5 days Moon lighting on a flight from Sydney Australia up to the top of Australia & back.
It is 50 years since I flew them but I still have all my manuals.
With the R 1830 Pratts in our manual it says “Cruising between 1900 & 2050 rpm & below 1700 rpm is prohibited”.
(Ps Did I pass the test?)
As for Carb heat I don’t remember much except Carb Ice was a problem from time to time.
MSFS DC3’s Rudder has a sort of stearing built in as you sure needed Tail Wheel Lock, Independent engines & brakes in the real thing to taxi & take-offs.
All this should bore a few people, so back to flying a fun Aircraft, docile & easy to fly once airborne (Except in a Thunderstorm when your going down with METO Power!)