First, Focus Fusion Society is a non-profit. So this whole discussion should really be directed to Lawrenceville Plasma Physics, Inc.
Second, what you are decribing are shares–stock. It does not matter to the SEC if we call them shares or not, according to SEC regulations, they are shares. Shares can be voting or non-voting. To sell shares to the general public, LPP, Inc. would have to have a prospectus and an initial public offering (IPO). This costs a lot of money. At some point this will no doubt make sense, but right now it would not.