Interesting you say that. It is also my belief that the aircraft should be held off until all possibility of flight is exhausted. In the UK, a light aeroplane was required (prior to EASA) to have a 'Star Annual' every three years. the aeroplane was also to be flight tested at this time. Specific in the flight test report form was the question "does the stall warner activate on landing?,' It was considered that it should not. The stall warner was required only to become active 7mph or 5 kts. before the stall (happy to be corrected on these numbers, I'm writing from memory).