Vadim,
> I have some idea how to modify option 4 above
> but I'm not sure is it good or not since it doesn't
> add any new functionality but INHO just tiny bit of
> convenience by making Maxima plotting more uniform.
Uniformity makes Maxima more predictable, and then
there are fewer confused & unhappy users.
So increasing uniformity (all else being equal) is a good thing.
> At plesent Maxima plot command complains if gnuplot_term
> is not one of the three - default, ps, dumb.
> Let's remove this restriction [...]
Agreed. The proposed syntax seems OK to me.
Thanks for working on this problem,
Robert