For keeping the camera steady; instead of taking the photo's of the coins on the table, why not blue-tac them onto a white wall (or onto paper and then onto a wall). Then you'll be able to use a normal tri-pod to hold the camera steady.
And for the flash problem, this may or may not work. But sometimes I've used a CD to bounce the flash so it doesn't strike the object to much. Something like that may do the trick, you just tinker with the angle of the CD (or whatever reflective surface you have to hand) until you've got the right amount of light hitting it.
That's my two cents (get it, it's a coin related pun! )