abusefilter-view-private user right
There is currently a discussion on enwiki about how to distribute abuse filter rights between different user groups. One proposal is to separate the right to view private filter details and the right to edit filters, and assign these to different user groups. Currently, these rights are both granted by abusefilter-modify (Views/AbuseFilterViewEdit.php, lines 222-225).
The attached patch allows the optional allocation of a new user right, abusefilter-view-private, which allows usergroups without abusefilter-modify but with abusefilter-view-private to view hidden filters. Users in such a usergroup who view the hidden abuse page should see all the Big Red Buttons and text fields grayed through $readOnlyAttrib, and aren't assigned edit tokens either. (I haven't tested the patch, though, so someone'll need to give it a test-drive.)
Users with abusefilter-modify automatically have the ability to view the hidden filters, so there's no need to give those users abusefilter-view-private on top.
Even if this functionality is not exploited on enwiki, I am sure that there will be other wikis, WMF or otherwise, which will find it useful.