Is this something that can be fixed? It only adds people to the datafile when joining, which isn't optimal when loading it in the middle of a wipe haha

So you want everyone currently on the server to be added to the data file when hot loading the plugin? I am not sure why this is a huge issue as the data file only stores a players preference for sharing blueprints automatically which by default is true if no value is found in the data file.

Yes, or perhaps make a command to sync blueprints manually (because I see many reports of people having to disband their clan and remake it in order to force sync blueprints) :) Great plugin tho!

Are you using an older version of the plugin because the data file in the current version would not cause that problem. There is already a command to manually share blueprints between two players. What do you mean by blueprints are not syncing?