Ludwig,
Sorry for the delay in getting back to this! We agree, the 810px view can be.. annoying. It's much, much better than the old 520px view they had until earlier this year though!
If you want to redirect from the Page Tab to the Canvas, it's likely not that difficult, but will require a code change. Please open up the /components/com_jfbconnect/libraries/canvas.php file to edit. Around line 161, you'll see the following block of code:
else
{
$tabTemplate = $this->configModel->getSetting('canvas_tab_template');
$this->setTemplate($tabTemplate);
}Change that to:
else
{
echo "<html><head></head><body><script type='text/javascript'>top.location.href='http://apps.facebook.com/your-canvas-url'</script></body></html>";
$app->close();
$tabTemplate = $this->configModel->getSetting('canvas_tab_template');
$this->setTemplate($tabTemplate);
}That should redirect the user to your Canvas area. Honestly, you could redirect to any page, but I'd recommend staying 'within' Facebook just to be safe. Not sure what their terms of service say about redirecting away from the Page Tab. I'm sure they'll be much more comfortable if you just go to your App though.
The code above is untested, but we use the same code for our Requests to redirect the user to your site. So, it should work, but let us know if you run into issues!
Thanks, and good luck,
Alex