I've noticed that only some of the shortcuts for Tools work with the Shift key. Here is a list of those that don't (meaning nothing happens at all):
Shift+H for Hand tool
Shift+V for Move tool
Shift+I for Color Picker tool
Shift+S for Clone Brush tool
Instead, one needs to hold the Enter key while pressing the designated letter shortcut - something I stumbled upon completely by accident as I was writing this post and compiling the list above. Also, holding either the Enter key or Shift key seems to works for the rest, with one exception - I was unable to find any keyboard shortcut that works for this tool set probably because it's mapped to the 'B' key, used for other brush tools - but this group isn't in that toggling:
Blur Brush / Sharpen Brush / Median Brush / Smudge Brush
I don't believe I've done any custom keyboard mapping. This inconsistency of Shift only working for some, while Enter works for all but one, seems bizarre. Is this a bug, or something I missed somewhere?