I can only answer from my own experience. In Finland, chicken manure is commonly used for gardening... it's sold wherever garden supplies are available. Often it's mixed with sea kelp.
Yes, it is adviced to push it in the sides of the container when planting a seedling, so the fragile newbie roots wouldn't be burned by it. Or, the manure is mixed with water and used as liquid fertilizer.
If you have manure from your own chickens, just make sure they are all healthy.... in order to avoid any salmonella danger. If you have a commercial farm, and use antibiotics, I'd be concerned about them passing on to manure and to the plants - with organic chickens, there of course isn't such an issue.
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