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The aftermarket button could have been installed for a reason other than the previous owner being too cheap to buy a new ignition switch.
Here goes:
Some racers like to lock up the centrifugal mechanism in the distibutor. In doing so they remove the weights and springs then twist the mechanism to full advance and braze the advance cams on the centershaft to the portion of the advance plate that lies directly under the cams.
When you lock the advance out completely , the engine fires at total advance even during start up. This can cause starting difficulties with a high compression engine....Solution? We use two switches, one for the starter and one for the ignition. So you can turn your engine [your button] and get your engine rotating and then you turn on the ignition. [your key]
Check your distributor for the above mentioned modifications. If you have these modifications your button has a purpose. If your distributor does NOT have these modifications, well I guess the previous owner was too cheap to buy that Porsche ignition switch. Hope this helps.
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