Pehkui scaling options no longer work. In addition, newer scaling options have been introduced

Some scaling settings have to be enabled in the server, use the cpm command https://github.com/tom5454/CustomPlayerModels/wiki/The--cpm-command#scaling

Actually I came here to ask the same thing as I have a character whose scale I set to .5 and I want to double their motion and reach settings. Whenever I try to do the CPM command and set it to true, it doesn't seem to change anything.
I'm probably misunderstanding it but from looking at the CPM.json file in a world, I assume it's on a per-world basis, and if so, is there a way to make it set it to "true" automatically?

Default server configs were added in 0.4.0a, and a scaling enable all command. You have to re-log after entering the command to work.