in the default theme the warning text only displays on one line with some poorly indicated scroll down button
the same happens for the recovery message although at least you get about two lines of text there
I was hoping for our securty warning to say something like
This system belongs to ACME.com and is protect with full disc encryption. Only log on if you are authorised to do so. If you have forgotten your password click "cancel" then "Options > Recovery" and follow the on screen instructions. If you have found this system please call +44 870 342500 quoting 523521432.
and be easily viewable, I guess the only way to improve this is with a custom theme and embed it into the whole image background?