I am using preference manager for my Inovelli devices, and I see two of them for #51.
Preference '51. Disable Physical On/Off Delay' (name:parameter51)
Preference '51. Disable Physical On/Off Delay The 700ms delay that occurs after pressing the physical button to turn the switch on/off is removed. Consequently this also removes the following scenes: held, released, 2x, 3x, 4x, 5x tap. 1x tap and config button scenes still work. (firmware 1.19+)' (name:parameter51)
What's the difference?