Great questions! You can set “Defaults” on the generator that will affect 3 places - when you get the generator page the defaults will be loaded with your pre-selected options, when you set up an RSS feed to autogenerate it will use the defaults and when you use the Chrome Extension to autogenerate it will use those defaults.
You can manage your default settings by navigating to the Autogenerate page (Content > Autogenerate) and clicking "Manage Defaults" above the green "Autogenerate Content" button. From there, you can add in any Hashtags, Twitter mentions, images, which campaign you would like them to be associated with and even a link if you'd like to include a different link in your posts than the one you generated content from. You can also choose if you would like to enforce keywords, shorten links and rotate hashtags, and those choices will be automatically filled in and selected each time you generate content. Then just click "Save Defaults"!
You can access these settings in the “Additional Options” drop down if you ever want to make any changes on the fly. Here is a helpful How To Video if you'd like to see it in action!