Jeff makes some good points. Mainsail slides do make raising and lowering the main much easier and safer while not adding to the performance of the sail. I have been planning on having track slides added to my current main when I retire it for cruising. Its that much easier to handle shorthanded. As for performance, slides arguably reduce the performance of the main by allowing an equalization of pressure through the gap between the sail and the mast. Mainsail slides should be allowed.
As for headsail hanks, they also make sail handling easier by keeping the entire luff attached to the forestay (no worries about dragging the sail in the water). The reduced friction makes raising and lowering easier. Lowering is so much easier that the sail pretty much drops itself negating the need to have the foredeck crew go forward to pull the sail down. The performance change between hanks and headfoil is debatable from each side and is probably negilible. The real gain is in keeping weight (crew) off the bow and reducing weight aloft. The J24 fleet saw the improvement and all changed over to hanks some years ago. After all, how often in a race do you actually need to change headsails? I would predict that allowing hanks on the headsail would result in many, if not all, boats modifying their sails and removing the headfoil. More debate is needed on this issue.
If you are looking for ease of sail handling and racing performance, I'd look at the furlers with the removable drums. You can furl your cruising sail and remove the drum and use your racing sails. There is an increase in weight aloft. But isnt there a trade-off for everything? Notice that most of the new one-designs come with furlers as part of the class rules.
