I can't give you any suggestions about the ethics of the use of restraints but can offer you examples of real cases I've encountered that have actually gone to ethics committees:
Teenage girl with acute mental status changes found to have Anti-NMDA receptor encephalitis. This is a rare disease and is sometimes associated with ovarian teratomas. Parents discovered this through the internet/youtube and elected for a complete oophorectomy. The entire work-up the child had had revealed NO ovarian involvement but the parents were convinced that this would cure her. The child is now infertile and still having problems from her encephalitis. The Ethics Committee at the hospital and the court system sided with the parents because their goal was not to sterilize her but to cure her disease.
On that note, there was a very famous case a few years ago about parents' decision to sterilize their severely developmentally delayed daughter: Ashley Treatment - Wikipedia, the free encyclopedia
Child with end-stage brain stem tumor whose parents refused to believe that she was dying and requested a permanent tracheostomy and long-term ventilation. Ethics committee sided with the parents. Support was eventually withdrawn on the order of the ICU team after brain death was pronounced.
Previously healthy child diagnosed with X-linked adrenoleukodystrophy after presenting with a new seizure. This led to discussions of testing the child's younger brother and, if he was found to have the disease, whether to proceed with experimental treatment despite the presence of no symptoms. Specifically, the question was whether to proceed to stem cell transplant for the brother without knowing when his disease would onset and to risk death from the transplant itself. I do not know what the outcome of this case was.
Children with congenital brain malformations who are likely to live but with severe impairments. In rare cases, parents do not want this life for their children and choose not to treat them. What then? Nursing Center - Journal Article
Pediatrics and genetics are FULL of ethical issues, especially when you combine the two.