teckel:
Probably easily fixable but not so much without the hardware in-hand (which I don't have). You could try fixing the library for your specific microcontroller and then submit the fix.
I've been digging around at http://ww1.microchip.com/downloads/en/DeviceDoc/megaAVR-0-series-Family-Data-Sheet-40002015C.pdf and the Arduino files and this is too complicated for my brain. From what I understand it seems all the registers and every constant need to be changed. All I did up to now in my life is solder wires, resistors, leds, etc. nothing fancy like microcontrollers and such. I wanted to try and do an alarm thing with light patterns and sound for when my homemade baby gate was open instead of just a steady lit led. I got everything working but wanted to use more of my 5vrms speakers so the sound would be louder.
Is there a way to do this with normal components like diodes and transistors?