It would be good if the Shift button could work as a keyboard Shift to type uppercase letters in the keyboard.
What is the problem?
In the Tracker (only have the Mini but could also be applied to other products as OG, Play) keyboard, to type uppercase letters you need to first select CAPS and then type the letter and unselect CAPS.
What do you want to achieve?
Shift key would work as a normal computer keyboard by temporarily for that selected letter add it as uppercase.