[AndyJCP]

pianosound, you're right. F7+F8 or F6+F7 switches to the Smart Tool.

filosofem, now I'm totally puzzled. My PT8 reference guide says:
"To temporarily switch the Smart Tool to the
Pencil tool, press Start (Windows) or Control
(Mac).
To temporarily switch the Smart Tool to the
Eraser, press Alt+Start (Windows) or Option+
Control (Mac)."

The latter one does not work for me.