[instaviz-users] how to set a default style for a node?

[virga]

is it possible at this time to define a style for a node, and set it
as the default style for every new node that is created? additionally,
it would be great if i could define the style for a few items - a
square node, oval node, arrow, and access them in some sort of
palette. as a designer, i'm a style junkie and am compelled to change
the serif font and add some color to my charts. setting the style
options is getting very redundant beginning to feel like a waste of
time. let's make it easy!