[TrullSin]

How can I disable a command from being executed? (dont want to use admin_overrides.cfg)
Tried to hook an event at start with new flags but I dont like that way.

[alphaearth]

You can give commands to admin groups.

addons/sourcemod/configs/admin_groups.cfg

PHP Code:

Groups
{
    "admin"
    {
        "flags"            "abcdfghjk"
        "immunity"        "92"
        "Overrides" //"[override1]" "[allow|deny]"
        {
            "sm_map"    "deny"
            "sm_votemap"    "allow"
        }
    }
} 


has the admin group:
You cannot use sm_map.
You can use sm_votemap.

[Psyk0tik]

You can do one of the following:

1. Edit the source code and add a check to disable the command inside the callback.
2. Comment out the line that registers the command.
3. Use overrides to deny anyone access to the command except for "z" (root) flag.
4. Use a command listener. (This won't work if the plugin registering the command loads before the plugin with this command listener.)

The override system is meant for cases like this so I don't know why you wouldn't want to use it. It's easy and convenient for what you're asking.