Comment 9 for bug 187458

The principal difference between a tool and non-tool is that a tool can create objects or do some other special thing by dragging anywhere on canvas (not by dragging some handle). You can edit stars in many tools, but to create them you need a tool. One might imagine some sort of dialog for creating stars, but it won't be as easy as by simple drag on canvas. And for tweak tool you can have no substitute at all, because its entire action is via dragging. For the wavy line, there's no action that can be done only by dragging and is not done by some other tool such as pencil or pen; therefore it's not worth creating a tool. It's purely a LPE that you apply to an existing path and edit via the LPE dialog or via handles on canvas.