Unfortunately, I don't think gplot's legend statement will let you do what you're wanting.
But, as always, if you're willing to do a little extra custom coding, you could 'fake' the legend you're wanting with annotate:
data anno_legend; length function $8 style $35 text $100; xsys='1'; ysys='1'; hsys='3'; when='a';
function='move'; x=50; y=95; output; function='draw'; x=60; line=1; color='black'; size=.001; output; function='label'; x=55; position='+'; style='albany amt/unicode'; text='25cf'x; color='black'; size=4.0; output; function='label'; x=61; position='>'; style=''; size=2.5; text='Super drug'; output;
function='move'; x=75; y=95; output; function='draw'; x=85; line=3; color='black'; size=.001; output; function='label'; x=80; position='+'; style='albany amt/unicode'; text='25cb'x; color='black'; size=4.0; output; function='label'; x=86; position='>'; style=''; size=2.5; text='Old drug'; output; run;
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