There are basically two concurrent methods to drive an ignition coil.
Traditionally, a mechanical contact is operating the coil in flyback mode. In this mode, the coil resistance is limiting the current at low speeds. Recent electronic ignition circuits are still maintaining the low supply voltage and replacing the mechanical switch with a transistor or IGBT. In a modfied variant, the ignition coil has a lower resistance and is driven with controlled on-time rather than fixed duty cycle. This requires an electronic control circuit, that can predict the ignition time by knowing the crank angle at each time, an information that is generally available with modern motor controllers.
Alternatively, the ignition coil can be driven by a high voltage, e.g. powered from a capacitor. In this case, the switch (traditonally a SCR)is closed at ignition time.
In other words, the intended control method, switching a high voltage for a longer time doesn't make sense at all.