Incorrect and thereafter failing save of BrokenLinksChecker scheduler configuration

The CMS 10.0 BrokenLinksChecker service introduced a new setting property "nrHttpThreads".
However the Settings Management plugin uses the incorrect name "nrOfThreads".
Then when adding a non-existing property to the scheduler configuration there is a bug in the implementation where no extra room is added for the new property value.
This leads to an invalid saved state the first time (ignoring a "javax.jcr.RepositoryException: No corresponding attribute value at position 5") and "java.lang.ArrayIndexOutOfBoundsException: 5" errors for subsequent saves.