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Placing your new rosebush in the sun room sounds like the best choice.Planting it this late would be risky business. Keep an eye on the soils moisture for both all through the winter season. If the knockout rosebush is in its nursery pot, you might want to transplant it into a larger pot that has drainage holes in the bottom. Gives the root system more room to spread out.

No roses really do well with salt. Perhaps building an ornate garden protection wall is in order. This would not only protect the rosebushes and other plants in your gardens but would serve as a beautiful backdrop to set off your roses and plants.

Yes you certainly can. They are patented rose bushes though, so if we do such a thing we are hurting the patent holders financial well being. Many will say it is okay as long as you are only doing it for your own rosebushes and not doing it to sell them to others. There are older rosebushes that no longer have such patent protection that are okay to root and grow. Just keep in mind that we really do not want to hurt the financial well being of those whom bring us the beautiful new roses each year, as that will eventually lead to fewer being able to supply the roses and even higher prices. Here is a link to an article for you as well: http://www.gardencentermag.com/article/grower-caught-illegally-propagating-knock-out-roses

I would recommend buying some Bayer Tree and Shrub granules. Apply the product around each rosebush working it into the soils as directed on the label for ornamental shrubs. Water in well. This product has done very well for me and one application per season is all that is needed typically. Where sprays can sometimes not get at the culprits that hide under the foliage, this systemic gets at them by moving throughout the bush in its natural juices. I also recommend working some good compost and alfalfa meal into the soils at least once per year to help keep the rosebushes soils home healthy for their roots.

I like to keep my Knockouts to 30 inches in height or less (24 inches). Browning of the leaves can be caused by sun reflection burn,can be just a normal process by the bush to eliminate some foliage when it gets too full and the temps outside are high. Getting leggy can be just the shedding of foliage in an effort to keep cooler when it gets real hot out. You could try doing some thinning pruning so that the bush is not quite as full.