I´m using the Paddle swich S4 as IO swich or shift swich, but I cannot make the editor in either IL2 1946 or BOS to accept pressing the paddle + a button or swich! I only get a "joy button 4" in return when releasing it! Is there a way to "blank out" the release command DX_4? I think I had the script working as intended years ago but I cannot figure out when and what changed!
Any help will be appreciated!

Can you post a bit of your code?

Try

MapKey(&Joystick,S4,0);

In theory assigning 0 (zero) to a button will clear it.