Thanks, however you should keep it as its already compatible with your board.
I'm not sure how far I'll take things with my sketch (never have the time) but my intention is to one day create a Pulse Measurement library with functions for frequency, pulse width, pulse duty, flow, speed, power, energy, odometer, volume, phase, peak demand, averaged and instantaneous values, de-bouncing, stability, PWM output modes, PWM measurement modes, etc.