For example, Saenger's account is disabled because of Phabricator etiquette. In WMF wikis, users will seldom be blocked indefinitely in such situation. Probably we may allow a limited block in Phabricator.
Is this a technical request (Phabricator's code functionality should allow deactivating accounts and offer some field to define a time value)?
Or is this a social request (agree on some rules when to disable an account for how long)?
For the later, as I wrote in https://www.mediawiki.org/wiki/User_talk:AKlapper_%28WMF%29#Bitte_um_Entsperrung_beim_Phabricator (in German), I would recommend to start and lead such a discussion on https://www.mediawiki.org/wiki/Talk:Bug_management/Phabricator_etiquette as that requires community input.
Could you imagine doing that?
If community agree we can make a local hack before Phabricator allow admins to do this. We can create a page with list of temporary blocked user in MediaWiki.org and unblock users whose block are expired. This is similar to https://meta.wikimedia.org/wiki/Steward_requests/Permissions/Approved_temporary, where T12493: Setting a temporary usergroup (allow expiry of user rights via Special:UserRights form) is not resolved.
However ideally Phabricator's code functionality should allow deactivating accounts for a limited period. This should be reported upstream.
(Both technically and socially speaking) "temporary blocked users" do not exist currently, so the first step would be to agree when a "temporary" block should be in place. See my previous comment.