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I've thought about this for some time, but never got around to trying it. My concept was to use a low frequency RF/high frequency audio signal to produce an AC spark instead of the single pulse that is produced by conventional ignition coils.
The proposed benefit was to have a spark that would start at the same time as a conventional one, i.e, around 8 degrees before TDC, but which would then persist until the exhaust valves open. This continuous spark would insure that any combustible mixture that passed the spark plug's electrode region would be ignited.
The frequency would be something like 100kHz or so, or whatever was most efficient for the transformer.
As far as putting capacitors in parallel with the sparkplug gap, there is a product called Pulstar (sp?) plugs that do exactly that. The key to avoiding ignition timing problems is to limit the capacitance to 80-100 pF and using non-resistor wires.
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