You could definitely do that, but then you might also need to:

- implement a mechanism to find and click active page elements, track the browser actions

- recompile PhantomJS to support POST requests

- implement a page queue with checks for duplicate URLs

- implement some parallelization and failover mechanism for case PhantomJS crashes (it does)

- possibly implement support for infinite scroll

- setup your own pool of proxy servers

- setup a database to store the results

and finally make the whole thing simple to setup and use :)