OK, well I must accept that, since it comes 'from the horse's mouth'! I must have got used to this since I have been flying X-Plane, though it seems to me the feature was always there. It wasn't in any case quite as useful as it could have been, as the frequencies were often wrong for (i.e. differed from) X-Plane, but still...
So, I tried the COM frequency option in the advanced options instead... I see nothing come up though (I have the value set to 30). Where am I supposed to see the COM frequencies? Perhaps this won't work in X-Plane...
Thanks.