We have a terminology mixup. The SimpleChart widget inside of Mendix uses either the Flot charting libraries (www.flotchart.org) or the Highcharts libraries (www.highcharts.com). This widget does not use libraries from www.simplechart.net. My question is whether or not there are plans to incorporate new libraries from Highcharts anytime in the future. Also, now that I've looked at it, seems that Flot has new libraries too, so I have the same question for those.
Your best bet is to file a feature request. Thanks in advance.