This is true in and of itself. However, the true danger is that this
is would be a remarkably efficient way to trick other people into
doing things not in their best interest (as Marc VH points out) and
therefore I think this is a bad road to travel down. Let's keep such
functionality on the server/gateway side; it is easy enough to write
gateways as it is (and in fact it would be trivial to write a gateway
to accomplish exactly the functionality Rob describes).
Marc