here's a very concrete feature request: In gretl's GUI window for
gnuplot there's still some space below the drop-down list for the point
symbol (which applies at least to "points" and "lines-points"
IMO it would be useful to put a box there to specify the point size; for
example, a value of 0.5 would imply adding "ps 0.5" to the respective
gnuplot command line. The box could be exactly like the one for
linewidth, but of course would only be active whenever the point type
selector is active as well.
As a more general remark, I've learned that with gnuplot 5 it seems
easier (compared to gnuplot 4) to handle the data values that are given
"inline" in the gnuplot file, by specifying a named "datablock". Stuff
like shaded areas and so forth should be easier to achieve from gretl's
side I guess. But Debian for example switched to gnuplot 5 less than a
year ago (if I understand correctly, but could be wrong?). I wonder what
an acceptable timeframe for gretl would be to require gnuplot 5.