@Edmund In short no.
Reason being is that the super trend x-axis is time.... Its a big tricky - even for Opto - to stop and start time.
The historic data is time stamped when it is collected, so we can have a start / stop trigger for that.
Best you could do is to plot on the super trend a variable from the strategy tree, when you want to plot data, move the value you want to plot into that variable, when you want to stop plotting data, move zero into that variable.
Then, you would see the trend pen drop and 'clean up' the trend line while the process was off, but time will still keep ticking by and move the graph to the left, ready for the moment the time is right for the process to start again.
Also, by moving zero (or what ever non-process related value you wanted) to the trend pen, you could then easily filter that out of the super trend file if you need to do that.