Updated in version 12.

For simplicity, on the policy handling point, the state machines have been kept
roughly as they are; however, the following text added in 6.3:

"In principle, an implementation MAY change its policy on handling a Query
message at any time; however, the state machine descriptions here cover only the
case where the policy is fixed while waiting for a Confirm message."

From Adrian Farrel:

Can I change my mind about whether I want a Confirm 
while I am waiting for one? 
For example, in Awaiting Confirm state I may receive a 
new Query. Must I also set the R flag on the Response 
or can I clear the flag and move to Established state? 
 
Similarly, during the refresh processing (since the MA 
is now set up and I no longer need to see the Confirm) 
can I clear the R flag on refresh Responses? I think the 
state machine allows this. But once I am in Awaiting 
Refresh state, can I change my mind and send R=0 on my next Response?