Exhibit builder 3.0 - enable and other basic HTML tags

I have noticed that the WYSIWYG editor in Exhibit Builder 3.0 is quite a bit more restrictive than the one used in other parts of Omeka 2.x. I'd like to allow the use of more basic HTML tags on the exhibit pages of our instance, but I'm having trouble finding the right file to make the changes in. I know that TinyMCE is configurable, and the fact that it's different in Exhibit Builder than the rest of the site suggests that it's defined within the Exhibit Builder plugin folder. Can anyone point me in the right direction?

It looks like it is called in this line in views/admin/exhibits/page-form.php:

Omeka.wysiwyg();

That applies tinyMCE to all the text areas, with these default params:

initParams = {
            convert_urls: false,
            mode: "textareas", // All textareas
            theme: "advanced",
            theme_advanced_toolbar_location: "top",
            theme_advanced_statusbar_location: "none",
            theme_advanced_toolbar_align: "left",
            theme_advanced_buttons1: "bold,italic,underline,|,justifyleft,justifycenter,justifyright,|,bullist,numlist,|,link,formatselect,code",
            theme_advanced_buttons2: "",
            theme_advanced_buttons3: "",
            plugins: "paste,inlinepopups,media",
            media_strict: false,
            width: "100%"
        };

Passing in different configuration options to
Omeka.wysiwyg({}) in a JSON object similar to the default should let you change things around.