I would love to see a feature where you could customise the marquee text to display system information, for example:
$HOSTNAME = Mac hostname / computer name
$NETWORK = IP Address / interface
$MODEL = Mac model identifier (eg. iMac18,1) or friendly name (eg. iMac Retina 5k, 27-inch, Mid 2017)
The ability to have a multi-line marquee may also improve the readability of the custom text.
Alternatively, you could have the option for the marquee to read the contents of a file (with the idea being you generate the contents of the marquee text via a shell script, independent of boot runner).