Mistwell
Crusty Old Meatwad
I'm just going off my most common DM's reaction. Tapping doesn't trigger a pit, but if we suspect a pit or similar pressure plate requiring more than a light amount of weight on it, saying we place the end of a 10' pole against the area and push usually does it. We've probably done this maybe 5 times since 3e. Which I guess is often enough since usually someone is carrying a 10' pole (which has other uses of course other than a pressure plate, like this thread of 101 uses for a 10' pole).If we assume the pole is healed 3 ft. above the ground you would need to apply 150 lb worth of force to the pole. That’s a lot of force. You aren’t going to be tapping down the passage like that.
Give the imp a sack of gold and send it to walk ahead.