Yes, you can replace the 1/2 Friction plate, clutch boss spring, seat plate and retaining wire (clutch boss ring) with a full size friction plate.
The parts (# 4, 5, 6 & 7) are shown on Page 26 in this Microfiche:
https://dl.dropboxusercontent.com/u/55030067/1996-2007_VMax_Part_Numbers.pdf
These Guides will help also:
http://vmax.lvlhead.com/tips/clutch.htm
http://www.vmaxoutlaw.com/tech/double-d.htm
That's how I have mine setup now.
I originally just added the Barnett Spring Conversion plate.
Later I added the Full Friction plate because I burnt up a few friction plates doing a burnout (with a Shinko on the back) and decided I'd try it out.
Honestly the only difference I noticed was that the shifting isn't quite as smooth as it was with the 1/2 Plate in.
PS
The Only real tip is to make sure the Barnett clutch plate is aligned properly so it's tight against the friction plate behind it.
If it doesn't engage, pull it off and turn it slightly until it aligns properly.
Mine did that when I first installed it, I pulled the clutch cover back off and turned it until it was tight to the friction plate and it works great now.
Also the bolts just get hand snugged just like you would with the stock clutch.
The washers are flush or just past flush with the Barnett plate (so the springs won't hang up on the plate) if I remember correctly.
If you over tighten them you will also have issues with clutch engagement/disengagement.
I attached pictures of what it should look like (These pictures are from a Yami Warrior but it's the same Clutch Kit as used on a Vmax).