That's a good one, Bruno17! It's going in the Cookbook right now.
You could easily enough modify that, either hard-coded or in its configuration to limit to any group or set of groups.
And a single line excludes Sudo users from this limitation:
if ($modx->user->get('sudo')) { return; }
I'll bet you could do much the same thing to show/hide the Sudo checkbox, only showing it to other Sudo users. Either add some CSS to hide it, or some Javascript to completely remove it.
[ed. note: sottwell last edited this post 8 years, 3 months ago.]