I just downloaded and started playing with this. I noticed the pulley system does not work as expected. That is, make two pulleys (with ring) and the constraint algorithm doesn’t see all forces being applied at the same time, so no matter how much force it has on one side of the pulley system, the weight you’re trying to pull will go down as if nothing was pulling it.
I’m interested in this as a teaching tool but it doesn’t seem possible to teach about pulleys at the moment. Am I doing something wrong?