hi mate,
there was a big article published in KNEE journal this year showing the risks of not having your acl repaired. im sorry i dont have a link! previous thinking was that you could rehab the muscle strength and get similar outcomes as the repair. this has been shown not to be true and without a repair the long term effects are not nice: massively increased risk of meniscal damage (cartilage), long term instability and increased risk of osteoarthritis.
id push for the repair mate and in the meantime keep it nice and strong as it will improve post surgery recovery!
oh and yes atheletes have gone the rehab route before with minimal success! roy keane a big example, tried to strengthen but knee failed again and ended up in surgery! you can get away without a repair if u are going to give up all pivoting sport! doesnt sound like you!