Keyboard\joypad button utility to fire a command when depressing the button?

Hello again!

I need to customize either a keyboard or joypad button, to fire the "F6" key both when pressing down a button AND when depressing it.

I'll explain: I'm working on the setting and instrumentations of a research, and I need to keep things as easy as possible to manipulate. Here is a program's command which is a toggle: I need to press F6 both when I want the function to start, and it to end. Since you can't see the screen when pressing it, customizing it as a hold button would prevent errors.

Thanks for any help!