Topic on Help talk:User rights and groups

At the main-page it says; "Bureaucrats – ... , giving them permission to assign/revoke user groups"

Is the "assign/revoke user groups" truly only available to Bureaucrats/Sysop?

Or to be more specific, is it potentially possible that an additional user group is setup (by Bureaucrats/Sysop) that can be assigned by an Admin to normal-rights users? (This would be something of an intermediate user group, to potentially give some regular users a bit more features. Like for example the "Mark as patrolled" right.)

Seems possible, after a bit more reading up ...

ie: (by setting something like this)

$wgAddGroups['admin'][] = 'Trustworthy';
+
$wgGroupPermissions['Trustworthy'] = $wgGroupPermissions['user'];
$wgGroupPermissions['Trustworthy']['patrol'] = true;

Correct? (never (and not currently) played around with mediawiki at sysop level.)