Note the absence of DATABASE as an object type on that page.
Or maybe there is another way to organize the process of migrating multiple databases?
And finally, where it would better to create a feature request?
There really isn't such a thing as "feature request" here - there isn't anyone that really makes it a point to fulfill such requests and there is more than manageable work in process already. That said, discussion about what PostgreSQL can and cannot do, sent to the -general list, do get read by many including developers.