This little fix completes the standard ASCII characters avilable from the keyboard, with the following mappings:

Fn-Shift-( and Fn-Shift-) are [ and ]
Fn-Shift-< and Fn-Shift-> are { and }
Fn-Shift-/ is \
Fn-Shift-Space is `
Fn-Shift-~ is ^


Hopefully this can be applied to the Tosa build.