Restricting Remote Assistance

Can you restrict/administer Remote Assistance to suit the
following requirements.

- Disable the ability to send invitation via file?

- Is there a way of only allowing remote invitations to
only send specified email address? (an internal support
address)

and/or

- Can you stop invitations from being sent whilst
enabling the ability to offer assistance, currently both
functions share the Solicited Remote Assistance Policy.

It has been mentioned in another post that this policy
config may change in SP2 but I cannot find any more
resources to support this - and the XP SP2 Beta does not
appear to make any difference to Remote Assistance.

Any help on this topic will be appreciated,

Nick