First problem:
When I enter {Label into the Search argument box I get a number of suggestions which lead me to undocumented options e.g.

{Label Additional Information} finds 540 results in 49 resources all bibliographic references to commentaries on Biblical books - apparently I can search for Bible book information that appears in Factbook - I think this is documented.
{Label Anxiety} finds nothing in my library
{Label Archive} finds nothing in my library
{Label Alain} finds nothing in my library
I think that the Labels offered should be Labels for which I can find the parameters required to use them.
Second Problem:
I can't get it to suggest the Label for Source Criticism
ADMISSION: I am never comfortable using a system that makes suggestions then offers me no information on how to use it. I continue to be unhappy with the new Search help. I agree that the new Search help is more useful to the absolute novice and deserves further development. However, it is almost useless to the intermediate user who needs to see what options are available in order to determine how to build a complex search argument. We have lost the ability to consider whether we want a grammatical or a semantical role ... which semantic roles best fit our needs ... The more I use the new search help the less I like it and the more annoyed I am to be left with nothing useful rather than a less than perfect solution. I strongly believe that both the old and the new should be offered as they meet different needs.