Hi, 

The Option > Colormap Editor is only for the volume to surface mapping. To fix the edge color range, you have to modify the codes of BrainNet.m

in about line 420, the original codes are:
"tmp = surf.cylinder(:,5);
if max(tmp) ~=min(tmp)
k = 63 /(max(tmp)-min(tmp));
b = 64 - k*max(tmp);
else
k = 0;
b = 64;
end
tmp = round(tmp * k + b);
tmp(tmp < 1) = 1;
tmp(tmp > 64) = 64;
surf.cylinder(:,5) = tmp;"

modify them as:
"tmp = surf.cylinder(:,5);
if max(tmp) ~=min(tmp)
k = 63/(10) ;
b = 64 - k*5;
else
k = 0;
b = 64;
end
tmp = round(tmp * k + b);
tmp(tmp < 1) = 1;
tmp(tmp > 64) = 64;
surf.cylinder(:,5) = tmp;"

After these changes, Please ignore the numbers of colorbar in the final figure. Just ps it to -5 and 5, because at least four other places have to be modified to change the number. It is not necessary. 

Best,
Mingrui