legend: Set min/max correlation for max color values to network_plot?

[whitingw]

Is it possible to add the feature to set the min/max correlation for the maximum color values? For example: legend = c(.-7, .7)

Correlations of .30 are considered substantial for larger data sets, yet these appear washed out in the network plot. I do realize that one can use legend = 'range' to help with this issue, but that can lead to wonkiness, especially when the range of correlations is asymmetrical (e.g., -.1 to .7). Being able to anchor color values to specific correlation values using the legend argument (e.g., legend = c(.-7, .7)) would be extremely helpful.