The option to select users according to their period of inactivity could be a problem in institiuons with restrictive data protection policies. There could be implemented a capabilitiy to set or not set the right to see this option :

Proposed name and title for this capability:

15) Show users, who have been inactive for (period)
moodle/user:viewinactiveusers

(is illustrated in the screenshot with no. 15)