Curious what you think of our current approach to this.

We're worried about people spending a lot of time searching for the perfect component instead of just sketching out their ideas. That's one of the big problems that we see with tools like Omnigraffle.

But we recognize that people can work a lot faster if they don't have to keep sketching out the same components in every wireframe. Our approach is to use copy/paste as a mechanism for creating custom components.

We're already keeping track of everything you copy/paste from the canvas. You can delete them, star them, and insert them into the canvas from the "Clipboard history" in the menu at the top left. Our next step is to make them easier to insert into the canvas.