I also never use the Transform Tool, but when you set it up like this:

you can Scale uniformly by dragging outside of the Transform Gizmo, anywhere in the Viewport.
The fact that nobody else seem to have noticed this missing Scale option in the Transform Tool is strange, I mean, most people just use the hotkeys, but what if you don’t have a keyboard?
Anyway, thanks for pointing this out Jason! I learned something new today before even finnishing my first coffee 😉