I was working with a client a little while back and we needed an easy way to setup search on the dev and test SharePoint environments. What I came up with to resolve that issue was the following script that will take a source and destination URL and it will transfer the search settings from the one environment to the other. I am publishing this with the consent of and at the request of this client because he thought it was cool enough to share. I have not used this in a while but I do remember that there were some interesting error messages that came up when trying to migrate the schema because of duplicate properties but there is an option to exclude that if you are getting those errors. Enjoy.
I tried embedding the scriptlet itself but some of the xml was getting lost so here is a zip of the ps1 file.