You could do this with the API, though it would take some work. You can get a WADL file of the undocumented REST API methods by going to the following URL:

http://hostname:port/rest/application.wadl

These APIs are not documented because they're intended to be used by the product UI, not by you and me. Still, you can use them to automate the server.

In that API, there is a "process" resource that has methods that can be used to create and update generic processes. For example, to create a generic process, use a command like this example:

curl -k -u admin:admin "http://hostname:port/rest/process" -X PUT -H 'Content-Type: application/json' -d @newProcess.json

where newProcess.json looks something like this:

{"name":"newprocess","description":"","workingDir":"${p:resource/work.dir}/${p:process.name}","notificationSchemeId":"","properties":{"workingDir":"${p:resource/work.dir}/${p:process.name}"},"teamMappings":[]}

Tip: A simple way to see how the API is being used is to enable a browser extension that tracks requests, such as Firebug. Then you can create and edit a process in the UI and see what REST requests are being sent. With that info, you can create your own REST requests to be used outside of the UI. So to learn how to edit existing processes, open a process in the editor and have a look at the requests that are sent.

Hopefully that helps. Let us know if you have other questions.