since there is no neogk guide for non mod users in ESC menu. That's why I think it's safe to give the controls only for mod users.
Even without mod, all players at join to server have on screen some info about control-keys to use with mod:
Welcome menu.jpg 60.34KB
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The problem is that some people don't read!!! and also some players are scared about use of mod/s, so showing this info, helps them can be more calmed after see that is a common (needed) thing in server, and want to get it to play/enjoy.