Overinterpretation. Just because a Talisman can affect the bonded user at R: Personal, we do not automatically get that they are considered to be the same entity. Indeed that would have been a more concise way of communicating that the R: Personal trick worked, and how the Talisman extends the 'touch' of the bonded user. If anything, the formulation (that these 2 effects are explicitly enabled) would indicate (to me anyway) that the Talisman and bonded wielder are not to be considered a single entity.
I think I made a similar argument with Erik Tyrrell here.
Trivially. Anyone can use (Hermetic) magic through a given Intangible Tunnel, assuming (s)he is aware of it (ArM5, p. 162, perhaps more clear from Projects, p. 79).
Now, one could ask if you can automatically sense an Intangible Tunnel cast by your own Talisman, presumably triggered by your will. I'd say yes, but if that is not the case, investing an effect to make it so would be fairly trivial I think.
Again, as far as I can tell, the Talisman is not the bonded user, even though it gets certain perks. I'd require use of the "divide by 2" guideline (or the "specific type of spell only" guideline, HoH: S, box, p. 129).
Infact, I'm reasonably sure I convinced Erik he'd need to do just that.