The best way I know to acheive this is to make a selection out of the item you want to duplicate, (command click on the layer) hold down the command and option key and drag the art. This will make a copy of the art on the same layer. The new art will remain in the selection and you can repeat the process until you have all the copies you want
(Again, I'm on Photoshop 7) - How do I make my presets (brush & tool) stick?
The brush and other menus revert back to default on every restart!
The power of the presets is obscured by the low quality of the default sets. I guess a lot of people don't get around to changing them, or change them once and get frustrated when the changes are wiped out - a pity.