You can control Chrome's behavior by changing Chrome options or preferences. This can be done with OpenBrowser Paceword.
Open Browser about:blank Chrome --lang\=fi prefs=download.prompt_for_download: False, plugins.always_open_pdf_externally: True
The above example will open Chrome with language set to Finnish and (using preferences )sets PDF's to be downloaded without confirmation dialog and not automatically opened by Chrome.
Open Browser about:blank Chrome --ignore-certificate-errors
This one will ignore certificate errors in case site is using self-signed certificate.
More information about OpenBrowser and it's arguments here.