"Or" and Free Will

I was slightly irritated when I saw linguists using "FC" to abbreviate 'free-choice' (after Kamp, citing Grice). The ultimate philosophical concoction turned into a technology!

But let us see what Grice says about 'or'. Perhaps the metier of this truth-functor relates to matters of 'contingency planning' and thus Ross was well justified in being confused by his type of paradoxes:

"Post the letter!" -- my father told me.
"Post the letter" yields "Post the letter or burn it" -- from which I'll detach "burn it" and which I will comply.

----

Grice:

"Is there a case ... for the introduction
of a special particle for the expression
of disjunction?" (WoW: 71).

"At least at first glance, it might perhaps
appear that there is a further distinct
mode of employment for which the newly
introduced disjunctive particle might be
suitable or even in some way useful. This
mode of employment is one which I shall for
the moment call "contingency planning"".

"Suppose that my aunt has arranged to
come to visit me but I do not yet now
(if indeed a decisiion has yet been
made in the matter) how, where and when
she will arive. I might be reasonably
confident that she will NOT be delivered
by a submarine at a neighbouring naval
base OR by parachute to the Berkeley campus
of the University of California."

----

"But with regard to the possibility
and likelihood of arrival by commercial
aircraft at the San Francisco airport,
by passenger vessel at the San Francisco
docks, OR by train at the Oakland railroad
station, I am quite in the dark, so I use
an appropriate disjunctive statement as
the

--- FOUNDATION FOR A PROCESS OF
----------- REACHING A DECISION ABOUT MY
---------------- PROJECTED RESPONSE TO EACH OF
---------------------- these contingencies."


----

Yet,

"I may never learn in advance the precise
character of my aunt's impending arrival; I
may have to wait and see."

---

"I debate which one of a number of
transport facilities possesses or will
possess the attribute of being my
aunt's local desintation, or satisfies
(or will statisfy) the predicate "is where
my aunt landed"."

----

Grice compensates the weakness of the 'contingency planning' approach with an erotetic role for 'or' in x-questions, and one erotetic role for x- and yes/no questions for 'if'.