Just got a call from a father who sails an A-Class who has a 7 year old who wants a boat and his suggestion was use a boomless pocket luff rig with a curved (decreasing radius) traveller (so it cambers up automatically as you travel down) and this way kids can't bang themselves on the head with the boom if they aren't paying attention or it gybes on them when they aren't expecting it (which will happen). The cost difference for getting a slightly longer bent traveller is more than offset by not having to purchase the boom and it will speed up the rig/derig time.
cheers
RG