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Q1: you cannot. Description history is not a field. Rather it is part of the description field because it is a journalized field. Same as if you created your own field and made it journalized.
Q2: in the database, say your item in question is stored in fpdb001_ws_001.incident .. then the journalized entries are in fpdb001_ws_001.item_field_journal (going from memory here since I'm not at my computer). The trick here is this table stores all journalized entries for all journalized fields for all items within that container. You'll have to decipher the IDs using either the defn or defn_ver tables.
Q3: no. Since they are the same field.
Q4: no. You have to use the button that is part of the field.
Well all those questions were mostly a bust! Thanks for the detailed explanation.