First of all, short-selling can't force down your share price. Short-selling only forces down your share price if buyers don't emerge to defend your share price.
Banning short-selling cannot protect a bad stock. If nobody is willing to buy XYZ at a price higher than $.02 a share, then the price at which XYZ will trade will be $.02 a share (or lower). It doesn't matter whether you have short-sellers or not.
What drives stock prices down is the lack of people willing to buy them at the higher price. If the company has sufficient value, there will be sufficient buyers.
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