One thing about having a command like this is that some staff want privacy. They may be doing other things while being online and want to be hidden. Not to mention that finding a staff and the possibility of them being spammed by someone that just wants to say "hi". Also, staff can't join already started game lobbies, so players asking for help with hackers wouldn't be able to get the help they needed. Unless they were to make it to where staff could join already started games. If you need someone quickly, you could check the teamspeak or discord. Staff are on there most of the time and would be willing to help if they are free to.
Alternatively, you can record a hacker or screenshot a chat rulebreaker and report them here on the forums at
https://cbecrft.net/report.