Yes, rabbit manure is an excellent soil conditioner. Since such manure is accumulated most often in the case of pet rabbits, there is very little likelihood of weed seeds in rabbit manure since the rabbits are often fed prepared rabbit food which does not contain viable weed seeds. He reminds us that there may be some weed seed in the rabbit bedding material, but that should not be a major concern. Rabbit manure is also less likely to burn plants than some other manures, so it can be added directly to the garden. However, as with most manures, it can be composted with plant material waste before being added to the soil.
Manure contains nitrogen which helps with the composting of plant wastes.
Dr. Dickerson also recommends starting a vermicompost under the rabbit cages. Then you will have a source of good manure, worm castings, and a source of compost worms for other compost sites in your landscape. You can prune these trees from fall until the buds begin to swell in the spring. However, remember not to do major pruning on roses or grapes at this time of the year. If the roses have long stems that may be damaged in the winter winds, they may be pruned slightly, but do your major pruning in the spring.