Can you share your playbook step(s) that you are using?
Jon
Did you try setting 'directory' to the location where you want 'start in' to be?
If that doesn't do it, have a look at the module code, it's probably going to be fairly straightforward to add another module parameter, assuming the api supports setting the directory to start in. It would probably be less work than writing your own script.
If you do have to change the module code, please consider creating a pull request to get it included into ansible. You can use it as a custom module by copying into /etc/ansible/library (or wherever 'library' is set to in your ansible.cfg file).
Hope this helps,
Jon