Importing REW files was what I meant, although if they don't have the time to implement it they could at least provide a way for 3rd party to implement the conversion required for the importing.
You should really get a UMIK-1, without it it's quite difficult to find the optimal delay for your subwoofer. The Audyssey method for setting the subwoofer delay is pretty bad and I got a major improvement adding 2m to the sub distance in addition to what Audyssey set.
Also quick measurements with REW can really help with speaker placement. Using Audyssey as a measurement tool for this purpose is very slow, and the view of the results is very limited.