Hi Mark,
sorry for the late reply. Future plan is to allow pages to specify,
either in the body as microformat or in the head as a
meta/link/something else tag, a default interaction contact.
SamePlace would see that and ask the user permission to connect the
page to the specified contact, with the usual options "allow once",
"allow always", "deny". A user confirmation is needed at least once
for obvious security reasons.
There's no roadmap for this at the moment, although if you need it to
implement something interesting, that surely helps increasing the
priority. :)
-m