WLP 10.0 + WSRP + Portlet Ajax (Adrenaline, out of the box)

Dear all,
I am working on a portal 10 project that uses 2 portal 10.0 instances, consumer
and producer.
WSRP: we use federation of user profile preferences as well as custom data
federation (BackingFile extending AbstractJspBacking).
the backing component on consumer side works fine: it collects the necessary
parameters and puts them into the request sent to the procducer portal.

now, this works fine as long as the portlet are run with preference
asyncMode=none.
If we configure asyncMode=ajax (for both, the procucer portlet as well as the
respective proxy portlet with the backing component), the federation does not
work anymore.

Reason:
we federate URL parameters. so in the backing component, we read the url
parameters and make sure they are sent to the producer.
in the ajax case, the request we access within the backing component is NOT the
original request anymore hence the AJAX framework by the portal (called
Adrenaline) is creating a new request (which makes sense) but the request
created is NOT containing the initial's request url params anymore.

Question:
does anybody know how to configure the ajax framework used by the WLP?
I actually would need kind of a backing component for the ajax framework now
;-)

thanks
cheers