not passing additional options?

These are not currently supported.

We changed the name of the option from “start_zoom_adjust” to “initial_zoom” when we overhauled TimelineJS to version 3, but neglected to change that part of the plugin.

We have never supported zoom_sequence , probably because it’s not something which is heavily used, but also because accepting an array in a shortcode attribute seems risky.

I opened an issue in our issue tracker about this. We don’t spend a lot of energy on the plugin these days, so we’d gladly accept a pull request which implements these. Otherwise, we’ll see if we can line up a student to work on the feature sometime.