Ah but Plan-G isn't JUST VFR.  There is even a little button labeled IFR on the menu.  :)  WLIX is  right, SID/STAR would be an excellent addition.  Why be the best VFR planner when you can simply be the best planner.

That said I find Plan-G very useful for IFR and VFR planning as it does support all the necessary way points.  Being able to reference "V" routes (I think that's what their called) in the plan would be a nice touch but there is nothing stopping you from planning out your STAR and SID in Plan-G, it just doesn't have them canned for you so you just have to add them using the charts for reference.  That's what I've done anyway.  :)