If you are using Gamemaker Studio, you can set the room speed to about whatever you want... except decimals.

Luckily there's a function called game_set_speed(value,type)
You can set the speed in FPS using the type gamespeed_fps or in microseconds per frame using the type gamespeed_microseconds.
With a bit of math we can figure out that the microseconds you need is based off like so: (1/59.73)*1000000=16472.0057

So make a object on the start of your game that sets the game speed like so: game_set_speed(16472, gamespeed_microseconds)

This is pretty cool! Although honestly noticing the difference between 59.73 and 60 is probably quite difficult. XD