ThingSpeak Live Chart, multi channel, second axis, historical data, csv export

This is great, appreciate all the effort and making available to the rest of us.
I have been able to get this to work fine with my data from ThingSpeak. I was wondering if there is a way to change the type of chart or way of displaying the information? I am using the spline chart type in ThingSpeak and would like to see something similar with the highcharts. I am new at this and tried to see an option in the code, but could not. Thanks!