How can I show the basic math operators in a toolbar?

I find it tedious to switch betwwen the mouse (to select cells with
the mouse) and the keyboard (to enter operators) when im writing
simple formulas. For simple formula entering I would like to only work
with the mouse.

I miss = ,+ ,- ,* ,/ ,^, (, ) and : as clickable in a toolbar.

I will be thankful for help,

Regards