I use the Zero Origin Tool in conjunction with the Alignment Guides to measure more accurately. The Zero Origin tool guidelines are lost on a white background in Pixelmator Pro. The ability to change the color of the guidelines or adding an icon like the shape tool has, would allow for fast accurate placement of this tool.
Btw I love the new appearing/disappearing grid as you zoom, thank you for that!
What features would you like to see in Pixelmator Pro?