the antialiasing is executed by your graphicscard, if you aren’t happy with it, consider buying a better one. how many modes does your card support, mine offer 3 quality steps.
anyway, its not a vvvv issue but a hardware one.
what do you mean with width of ex9.geometry nodes ? do you want to make a box or a sphere bigger, just scale it.
solution 1. u could fake the wireframe mode with textures with transparency. then u are free to choose whatever linewidth u want.
solution 2. rebuilt the mesh with the line object, then u can change the linewidth as well. probably hard for a newbie, if u never touched vertexbuffer etc.
rebuilding mesh with Line(EX9.Geometry) was imposible in my case. vvvv crashes when i feed too many points into Line node. I managed to crash windows also while trying to feed more than 900 points using circular spread maliciously.