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Chickens need a balanced diet, and some higher quality feeds provide this for them. I use all-purpose poultry crumbles, and in a few weeks I'll be using layer crumbles. This provides them with the necessary calcium, protien, grains, etc. As far as scraps go, there's really nothing you can give them that would complete their dietary needs, unless you mixed your own feed. They LOVE greens, like lettuce, grass, etc, but greens alone won't do it. Bugs are a source of protien for them, but they won't get enough unless they free range 100%, and the wintertime is pretty scarce. As long as you're feeding a complete feed, like layer crumbles/pellets, your chickens should be fine. Too many scraps and/or scratch will cause them to not eat their actual feed, which can interfere with nutrition. It's also a good idea to offer them oyster shell free-choice (meaning it's in a little bowl that they can eat from whenever they feel like it) that way if the hen feels like she needs a little more calcium she can go over there and get a bit. DO NOT mix it into the food!
Lighting also determines the chickens' laying cycle. Their bodies tell them to lay during the warmer seasons, when the days are longer and the nights shorter. This is because it wouldn't be efficient to hatch eggs when it's 10 below. You can simulate the daylight by placing a light bulb in the coop on a timer, and set the timer so that the light goes on a bit early in the morning (not at night, cause sudden darkness will confuse them and the won't be able to roost....they're practically blind in the dark, so they won't be able to see to get on the roost). As the days continue shortening, increase the artificial light. The light should NOT be on as the sun begins to set, that way they are able to roost.
Chickens need grit to grind their food. Small rocks, pebbles, sand, sometimes even pieces of glass, are ingested and work as their 'teeth'. Once a chicken gets a few decent pieces of grit in them, they may not ingest any more until the first pieces get worn down. Some people have found large, round, smooth rocks inside their chickens, meaning the chicken ingested the rock when it was even larger and rough instead of smooth. The longer it's in the chicken the more worn it gets, until finally it's too small to do any grinding and the chicken eats more. If the area your chickens use as a run doesn't have any gravel, you may want to toss some in there. Go to a quarry with a ziplock bag, wal mart bag, or whatever size you need, and ask them how much for 'this much' gravel. Usually they'll laugh and give it to you free, but if not it may cost a few bucks. Toss the gravel in the run and that's the end of it.
Hope this helps, and
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BTW, DO NOT give chickens under 20 weeks layer pellets! They cannot process the extra calcium and it will cause kidney failure! Wait until 20-22 weeks before giving them layer food like layer pellets or oyster shell. I did not switch mine to layer pellets, but at 20 weeks I put some oyster shell out there so just in case one of them needed it they could get it. Then, when they all start laying, I'll switch them to layer feed.
Scratch is like chicken candy, it's a mixture of seeds and other stuff that they don't really need but like. Do not feed too much scratch, otherwise they'll choose the scratch over their feed and be nutritionally lacking. I throw a few handfuls out to them in the morning, and that's it.
I wouldn't feed them chicken or ham, simply because I've heard there have been problems feeding chicken products (except scrambled eggs, they LOVE that) back to chickens, such as disease and illnesses. They are not designed to be cannibals. Ham is very processed and salty, and wouldn't do much good for their systems.
Sounds like you have spoiled chickens! Fussy? LOL! Just give them what you know their bodies need, and they'll love u for it! Throw them some treats here and there, but don't overdo it. Your main concern is their health, their happiness will come with it. As long as they have adequate nutrition, light, space, warmth, and exercise they'll be fine!
