Hi,
I was wondering if it could be possible without too much effort to 
enable mouse-wheel-based scrolling or zooming as described here: 
http://gnuplot.info/docs_6.1/loc14336.html
I know that in a gretl-controlled plot one can already select "zoom..." 
and then define a rectangle with the mouse. This works nicely.
I also know that after saving the plot as a session icon and then 
executing the raw gnuplot code, one gets a native gnuplot window (not 
gretl-controlled), and there the mouse-wheel thing works as well. (This 
is on Windows 10.) So as an alternative route it might also be a 
possibility to make it easier to send the plot directly to native 
gnuplot, instead of having to go via the raw plotting code first.
Thanks
sven