Interesting update.
I backed up my database, then accessed it via phpMyAdmin in cPanel and went to the users table. I clicked the edit button (the pencil icon) next to my user and manually changed the user ID number.
However, after manually changing my user ID number, I was no longer allowed to access my admin dashboard.
Then, I went back in the database, and changed the user ID back to 1.
Everything went back to normal, and I was able to access my dashboard again.
So, it appears user ID number cannot be changed without issues, either with this plugin or manually.
Agree/disagree?
Still a security threat/not something to worry about?
Cheers
Wade