I love the path tool. It's perfect for laying down panel lines and paint stripes, among other things. I do have some ideas to increase its functionality and provide better quality of life for its use:
Fill mode for closed loop paths for masks and color/height/etc. information.
The ability to set default options for corner/smooth vertex types, and for the Path tool to remember what was previously selected when creating new paths.
The ability to select and move all vertices as a group
The ability to snap to lines and vertices of other paths
The ability to select brushes (for example, alpha stamps) to be applied on the start and end vertices
The ability to 'center' the placement of alpha stamps and etc. instead of starting the placement at the beginning of the path. (Red x indicates current behavior, blue x indicates new optional 'centered' placement behavior.)
The ability to alternate rotations for each alpha, brush, and etc on a path. (Orange indicates a 180 degree rotation on stamps from green.)
Angle snapping in selectable increments when holding the shift key.