I'm sorry, Shem, maybe I missed it but I didn't see any new contributions in your post. Yes, the methods that you listed are valid, but 1) they might not be consistent with the Assumptions listed in the Introduction and 2) are included in the General Influence Guide.
The purpose of this walkthrough is to gain (or lose) the required influence with each party member as quickly as possible without sacrificing your PC's alignment. If the influence opportunities that you mentioned aren't in the walkthrough, it's probably because they don't meet both of those criteria (or aren't even necessary...or conflict with a influence shift required for another NPC).
On a side note, I'm pretty sure many of the examples you provided are already in the walkthrough, so I'm not clear why posting them again was necessary *confused*