random Koha bits

Information for sorting item type in searching comes from tag 942c because this is linked to the biblioitems.itemtype field in Koha. If one tries to link this Koha field to the 952c items instead it returns an error message because only Koha fields with the label item.____ can be linked to the items (10) tab. It also seems that the 942c field is used for sorting, but the information displayed in the public search display has the text from the 952c field. For example if one searches nonfiction books it will sort by this item type in the 942c field, but next to the book title in the public display it may say "audio recording" (952c field).

Question: does info in the order of an item (such as price etc.) transfer to the item information associated with a bibliographic record?

I created an order with brief bibliographic info (title/author). After I "received" the item, I edited the bibliographic record using the z39.50 search that auto-filled the bib record, "save and go to item"--and information that I had filled in in the order was already in the item fields (date of acquisition, costs). Additionally, when I used an already existing bib record and associated it to the order, there were two items, one that used the item information that I had filled in when I had created the bib record and one item that had all of the information from the order that I later created. I guess this makes sense, since a library may have more than one copy associated with the same bib record.

Revisit with 3.0 version: "Data Migration" in 3.0 manual

"Notices: Database Fields": I checked these suggestions for linking MARC fields to Koha fields. It looks like it is mostly set up to the specifications outlined. There are only a few suggestions that are not met that probably won't matter:
biblio.biblionumber link to 999c
biblio.serial link to 942s
biblioitems.biblioitemnumber link to 999d
biblioitems.volumeddesc link to 362a

Why is author not searchable in public display as an authorized heading, but subjects are?

I tried adding an added author in the 700 field (of a name already in the thesaurus) to see if this might shed some light. The name showed in the public display, but it was not linked to search on it, either. I didn't gain any insight from this experiment. The 650a tag is linked to the bibliosubject.subject field. I thought maybe this might be the key, but 100a (where the authorized author name resides) is linked to the biblio.author field as suggested in the manual. Is it somehow tied to information in the "System Preferences: Authorities"?