In the video he was leisurely turning the wheel using his fingertips. One revolution of the wheel should produce about 10 degrees of flaps.
If you watch the video closely his palm is on the circumference of the wheel and that's the affordance that control permits. You haven't specified your definition of 'easy' but this operation would require a lot more force in flight to overcome the air resistance. There will be considerable leverage advantage at the expense of long travel. So it might have been 'easy' in respect to force but it certainly isn't fast to deploy. Even though the gentleman in the video seems to have a 'contemporary build' shall we say, the limiting ergonomic factor is his elbow which cannot travel back any further because of the cockpit restrictions.
10° was not Hans-Joachim Marseille's definition of combat flaps (the term I've read for the setting he used was 'landing flaps' (full flaps I think)). I'm fairly sure not your definition either when flying the 109F in game?
Instead of hitting a key for flaps you should have to hold down a key. Just like we do for trim.
Analogue flaps would be a nicer idea (as a second option to what we have now), then for the 109, say, you could choose the degree you want precisely. The delay between what you've ordered and what you get could be modeled in.
Lot of variety in flaps, Spitfire flip switch two position, N1K auto combat flaps, etc.
