On this point, I think the manufacturer’s manual will be clearer than me, I don’t have this device 
From what I just tested, Gladys handles the « click », « double-click » and « long_press », but not the others.
Only you can tell us since you have the button at home 
If things are missing, you can discuss with the developers of this integration on the forum (all the people in this discussion: Zigbee2mqtt - Debug)
Regarding a date, we generally don’t talk about dates, Gladys is a free community project managed by volunteers, so it generally depends on the availability of people
Knowing that not everyone has the devices of others, the best way to bring compatibility is to contribute yourself!
In this case, you would need to isolate all the keys that this Sonoff sensor returns, and add them to the constant files of the Zigbee2mqtt integration in a PR. Ideally, you would need to adapt the UI to avoid displaying « 1 », « 2 », but rather translated words