I am, you'll be pleased to hear, an IMHA in my real life. That's the person in the UK you get access to if you're put under a mental health section and taken to a psych ward. Someone who can challenge the doctors on patient's behalf, make complaints and blow the whistle in the event of malpractice. It means I get a lot of access to psych wards - and everything you've said is completely correct.
I work in Medium Secure - which means that razor would be kept in a locker and that length of wire would be a no-no. All the furniture is so heavy nobody could throw it and the toilet roll is distressingly thin.
EUPD patients make repeated complaints because of the psychological benefit of having people running around after you. This is why it's more prevalent in the female wards - and can confirm the doctors definitely do just have their own timings. Most ward staff are a mix of diligent and lazy - but being on obs seems mind numbingly dull and patients can be very rude and aggressive (whether they're currently well or not).
Violence is rare but staff in Medium secure carry personal alarms and there is a very quick response from all trained nurses on every ward. We call it a divisional response. I've had one per year for the two years I've worked in Mental Health Advocacy. Staff in the UK could not have shared information (it isn't a question of choice) confidentiality is mandated by law, so it can be distressing to other patients, but that's the way it works.
And yes, one of my first complaints was by a person in a wheelchair who used the detachable arms as a weapon. They were deposited onto the floor for a number of hours whilst the team decided what to do. It was humiliating, I wrote a complaint on their behalf and the hospital since brought in a policy about having spare (safe) wheelchairs available in the secure part of the mental health hospital.
All this just to say, it sounds very similar here in the UK. :o)