Hello.
None of our pushbutton power switches have long press options, but it seems like you might be able to do something like that with the help of your MCU. You might take a look at the following forum thread to see how they accomplished something similar.
The OFF pin will take precedence if the button or ON pin is triggered at the same time. The button or ON pin will take precedence if the off pin is triggered at the same time.
-Derrill