Gday Damien
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Once I pictured in my head how the potentiometer functions
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With a PICand an ADC converter, its easy peasy.
With a passive analog system its a bit more complicated
but still quite simple, as long as you have a centre click pot.
ie centre is off, move either way fron centre and the speed increases and direction is based on what way from centre you are.
I used a 2 section Pot as one controlled speed and the other direction, ref attached schematic.
A Pic or arduino etc can do it much simpler these days,
but its not as much fun :-)
Andrew