Question about IWChartJS

I am getting able to use this chart for time series data visualization, but have two question I could not figure out or find an example:
1. for ctLine  -can you make the line a STEP line?
2. for the main bottom time axis - can you force the minimum and maximum values independent of the value pairs entered 
when adding the data?  It seem the bottom axis uses the mainSeries time span, and if a subsequent series data time span is broader than the first series - that data is not seen...

Thanks in advance - this is a nice chart

The alternative is the tCHART