I can do that, but its a lot of work everytime i select a car. I drive random cars from workshop, and I was accustomed on the shifting on assetto corsa where you can only use the paddle shifters if it is designed as one.
Do you drive from the cockpit/driver view normally?
If so, it takes 2 seconds to hit "free look" and look down real quick. Then just use one or the other(Paddles or H-Gate).
If not, it will take 2 extra seconds to switch to cockpit view and have a little look.
Sure, when I drive a sequential shift car, and I push the gear shifter into 3rd, it goes into 3rd... I just leave it in Neutral and use the paddles, problem solved.
I even use the buttons on the shifter to; adjust Brake Balance, Fuel/Boost Map, navigate pitstop window(selecting tyre/fuel for next pit), request pit, headlights, and the handbrake when I drift. I have yet to accidentally move the shifter into any gear while manipulating these buttons and using the paddles. I recently took part in a 10 race, 1hr endurance league championship with the EnduRacer GTE's, so I have many hours with this type of setup in use.
Sure, its definitely not as convenient as AC, but I couldnt say its "a lot of work" to press a couple of buttons and move your mouse a bit. And AC is not as realistic as rF, a very worthy trade off, IMO.
Also, during your 1st drive with a specific car you are unsure of, shift with the paddles first. If it takes longer than ~0.2 seconds to go from gear to gear, its a standard/stick shift. Most stick shift cars like the NSX or the AC Cobra will take between 0.5 to 1 second to shift when using the paddles, even if you leave your foot buried on the throttle.
Cheers, and have fun.
rocket