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They have tried Phil, there's been more than one example in the bottom bracket, though they've often been super expensive jobs. There's a US one and I think a Swiss one currently but I can't recollect the names.
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Flyer F-Series:
pro: most quiet (no gears in the motor, no additional chain,... quieter than the panasonic-drive)
con: heavy, not as efficience as the newer panasonic-drive
more pics:
Google-Ergebnis für http://www.velo-zuerich.ch/velo-zuerich/velo/elektrovelos/elektrobike-flyer-f4/flyer-f4-3.jpg
and then Flecc means maybe the optibike ?
