Ah yeah - googled around for this, and it seems there is a couple of different ideas on it.
"Larry" over at sprintusers is sure no phone setting matters for slot index.
http://www.wirelessadvisor.com/wireless_faq.cfm
Seems to say what I say - that at the CDMA level, it should pick the smaller of the two (tower or phone)
Quote:
II TECHNICAL QUESTIONS
Q 2.1 In CDMA what is meant by "slot cycle index"?
A 2.1 [Credit: Bill Walker]
On the CDMA Paging Channel (this is the shared channel that all phones
listen to for incoming calls and other control info), time is divided into
"slots". To conserve power, phones that are currently idle only "wake up"
and listen for messages on the Paging Channel during their assigned
slots. The slot cycle index determines how often the phone's slot comes
around. If the slot cycle index is 0, the phone wakes up every 1.28
seconds. If it's one, it wakes up every 2.56 seconds. If it's two, it's
every 5.12 seconds, and so on. The larger the setting, the more power is
conserved, but the longer it takes to page the phone for an incoming
call. You can imagine that if it were set to 10.24 seconds, few callers
would hang on the line long enough for you to answer your phone.
There are two settings that govern this. One is the "preferred slot cycle
index" in the phone, and can be set via service programming. The other is
the "maximum slot cycle index" set in the base station and broadcast in
overhead messages on the Paging Channel. The phone has to use whichever
number is smaller.
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At any rate, changing the slot cycle index while you're in there mucking about can't have any negative impact.