On further prodding this is more difficult than I thought, because we allow admins to select multiple revisions (and hence some with and some without elements of oversight) at the same time. Not to mention the fact that going from Revision-level control to property-level control would be difficult at the best of times. Eurgh.

I think that enwiki uses version 1.18.

Any new deletion flag (comment,text) would be oversight level since the suppress flag is set. Since non-oversights can't change that flag, then they can't do anything to the revision without violating permissions.

I think that enwiki uses version 1.18.

Yes, it displays on 1.18 and 1.19svn, naturally.

Any new deletion flag (comment,text) would be oversight level since the
suppress flag is set. Since non-oversights can't change that flag, then they
can't do anything to the revision without violating permissions

The point is, if the oversighter doesn't change the deletion status of the username/summary/text/etc i.e. leaves it visible, it should be possible for admins to RevDel it. But yes, I agree that the problem with fixing this is that at the moment flags are set per-revision, when really we would need them to be sufficiently granular i.e. be set per property.

Yes, I think the only way that this is happening is if the suppression flag got split up.