straw poll on issue 20 (selection ipsec sa addresses and who decides)

Folks,

At IETF-62 and on the list we discussed this issue
that relates to what (outer) addresses are selected for the IPsec
SAs, and who decides these addresses, the initiator, both peers,
etc.

This is a central question for the design of the mobike protocol,
as it is hard to design further details without knowing the
what we decide here. For this reason I'd like us to do a straw poll
on what alternative people feel most comfortable with. The
alternatives are discussed in

  http://www.vpnc.org/ietf-mobike/issue20.txt

in more detail, but essentially its a question of
the following choice:

  Option 1: "MOBIKE just informs the peer of our addresses; how
  they get used is a matter of local policy beyond our scope."

  Option 2: "Use the preferred/primary address"

  Option 3: "Initiator decides"

  Option 4: "Use the preferred/primary address if possible"

  Option 5: "Peers decide the source addresses independently"

(There are potential other variants of design but these
seem to be the main ones, or at least the current concrete
proposals for the MOBIKE protocol are covered above.)

Please make your opinion, along with its justifications,
known by May 25th.

--Jari