Scratch

In my "skeleton poser" project, I needed an atan2 function and I had to write my own (using atan and some if blocks).  atan2 is a standard function in most math libraries and is used to convert a 2d vector (dx, dy) to an angle in the full 360 degree range.  I use atan2 to rotate a sprite by clicking and dragging on it and I can't just use point-towards-mouse because the rotation is relative to the current direction as well as where the sprite was grabbed.

Having a built-in atan2 function would make my project simpler.  More importantly, it would make my sprites more portable (and understandable to other users) because the sprites wouldn't need to depend on the global atan2 script.