There's only one difference between ordinary shorting: to short in the ordinary way, you borrow shares that you then sell. You wait for the price to drop to whatever your target is, and then buy to cover. To short naked, you don't borrow shares; you just sell. When the stock hits your target price, you buy to cover, curing the failures to deliver caused by your original sales.
The advantage of shorting naked is that you don't have to locate stock to borrow, and you don't have to pay the fees associated with stock borrows. But you do still have to provide margin, and that margin will increase if the stock price rises. Your broker and/or clearing agent will not be willing to assume your (very considerable) risk. That money will be tied up until you cover, so it's in your interest to do so. There's no sense in waiting years to squeeze out a few extra percentage points on your position.
While naked shorting is not illegal, since the institution of Reg SHO in 2005 it's been against SEC regulations, and serious penalties may be levied against people who violate those regulations.
KMAG never went much above two cents. So I don't see it as offering a lucrative opportunity for shorts of any kind, at any time. There've been far, far better prospects out there.