English Wikisource has had a discussion where the local consensus is to request a configuration change to enable abuse filters to be able to block
$wgAbuseFilterActions['block'] = true;
please do NOT allocate a default block duration time periods
Please also set
$wgGroupPermissions['autoconfirmed']['abusefilter-log-detail'] = true;
Seems that there was a general conversation at T44012 though that only took place at meta, with no notification to English Wikisource. There is no requirement for that restriction, and generally that should be available.