Fluid - ViewHelper - Incubator

You can overwrite the browsertitle with variables from your extension.

<?php
class Tx_DlExt_ViewHelpers_SetBrowserTitleViewHelper extends Tx_Fluid_Core_ViewHelper_AbstractConditionViewHelper {

    /**
     *    @param string $browsertitle The name of browser title
     */
    public function render( $browsertitle ) {
        $GLOBALS['TSFE']->page['title'] = $browsertitle;
    }
}

{namespace dl=Tx_DlExt_ViewHelpers}
<dl:setBrowserTitle browsertitle="{myVar} in {myVar2} - My Title"/>