Allow the direct entry of the test start date into the AB Trend tool rather than forcing the use of a calendar widget to select the date. Or at least make the calendar display the date that was set rather then the current month.
It would also be useful to edit the sample workflow for this tool , sample 21_AB_Trend_Controls_Analysis_Sample.yxmd, to add annotations to each tool to describe what the settings are in the example as well as to add more specific detail to the workflow description.