I know this is an old question but if you're familiar with editing the xml files inside the individual packages you can change the inoculation cost there. I haven't found an option to do it in game. The tuning for the cost of inoculations isn't in the main Vector package but in the individual diseas...

Dang. Well thanks. I'm an old user, from back when Twallan used to run things. He had a suggestion area iirc, does anything like that still exist?

I want to allow teenagers to move out on their own, but only teenagers that have children.

Does anyone know if this is possible with the caste options? I've been through the filters and non seemed to fit but I could be missing something.

It counts all residents in that pool including resident pets, so that may be your issue. Try filtering by Species>Human first