Vennerable provides Venn diagrams in R. It displays Venn and Euler diagrams for up to 9 different sets and using a variety of geometries. It allows the display of area-weighted Venn diagrams and allows fine graphical control over the result.
You are probably right but I've not had a chance to check this. I've amended the file to note your suggestion and will accept the request once I have checked.
install_github wants a username