Ok... so, assuming I know nothing about PHP (which is mostly accurate) I think what I've found might work is this:
In schedule.class.php there's a get_reservation_colorstr function, that to me looks like what decides what colors to use. The color choices are pulled from config.php, so if I added a new If before pending to do something like:
if (substr($rs['summary'],0,3) == "NUR") {
$color_select = "nursing";
}
assuming I defined the color "nursing" in the config.php and I use the right string search function... that should work, right?
edit: Corrected my code with substr instead of instr
edit once more: corrected my = to == and it works

Thank goodness I still know how to reverse engineer
