Possible to modify the HTML head section title value?

Maybe I'm missing something, but I was trying to figure out a way to customize the value of the generated html page's head section's title value and can't seem to find a way to do it.

For the default Confluence theme, this can be changed globally by modifying the Main Layout via the global administration pages. However, it seems that the builder theme doesn't use that layout.

In my particular case, I'm trying to hard code a value followed by a dash and the page title into the title for every page within the space. For example: "HARD_CODED_VALUE - Page Name". Basically, I'd like to do this to control the title value in the user's browser and for if they bookmark the page.

So is this possible in Builder 2.x? If not, is it planned for Builder 3.x?

Thanks.