It would be nice if Forms 11 fired off a custom event when all lookups on a form complete. We could then listen for that event in our custom JavaScript and run our own code.
Currently we use polling to figure out if all lookups have completed (basically, we periodically check if all target fields have values), but this approach doesn't work for more complex lookups that depend on each other. So a "lookups-complete" event would be very useful.