In addition to allowing users to customize the order in which tools appear in the right-hand bar, it would be brilliant if Pixelmator Pro could figure that out for me. For example, after weeks of using the app, if I primarily use the Darken, Lighten, Saturate and Desaturate tools, but I never use the Type or Draw Shape tools in my workflows, the tools I mostly use would be listed (thus easier to select), while the tools I never use could be accessible via a "..." at the the bottom of the bar.
Say I always use Warp and Bump, but never Pinch and Twirl. Pinch and Twirl (since they're still a part of the Warp family of tools), could still be accessible by clicking once more on the Warp or Bump icons.
What features would you like to see in Pixelmator Pro?