This is not possible in switchard, but it really is a matter of granularity and composition of your applications, taking advantage of clustered SCA calls, which can be configured to try always locally to the serever the app is running, or will be remote if not co-located.
There is a new property called preferLocal to SCA clustered references.
Not the same, though.
thanks for the insight. this would be a very nice feature to have...