The only time i've found the the miles useful on shorthaul is when I've needed to get back to the UK from the med at short notice, and it's been cheaper then any other option.
I have a good sector builder on Saturday. Because i'm in the UK for a few days, work have booked my flight Humberside - Amsterdam - London - Oman, with the first two sectors on KLM. It's not worth me complaining, and it adds a few miles!
