This isn't a very big suggestion but I think it would be cool if everyone had the permission to use /seen Thanks for reading!
The problem i have seen with /seen on the Dyatrian server is that it shows the player's ip when you type the command.
From what I know, you'd need one more permission to see the IP and you wouldn't see it by default with only the permission for /seen.
What @lzongolo said is true, and also maybe staff should have access to the /whois command. This command tells you a players position, if they are banned, muted, flying, in godmode, what gamemode they are in and more