I believe to increase the realism of Infinite Flight pilots should be required to manually input the frequency number given when changing frequencies.
Approach: Cleared ILS Approach Runway 26L. Contact London Gatwick Tower on 121.14.
This would then be when the pilot would type in 121.14 (Given Frequency Code) into something like this for example:
Once they have typed in the frequency code and pressed enter they would then switch to the frequency that matched that code.
I believe this would be a great feature to further improve the realism of Infinite Flight and make the flying experience even more enjoyable.
Credit to @epaga for the screenshot of his app, In-Flight Assistant.