Wish to cancel the "R", "A", "S" shortcut key on the Selection tool's Tool Options.
"R", "A", "S" is not set and can not be deleted by itself.

Selection tool to use "Shift" and "Alt" is very convenient.

I put "A" and "S", set to "zoom in" and “zoom out”，They conflict.
When using the Selection tool and zoom in and out.

It can be said that "R", "A", "S" role is not, want to clear out

http://i.imgur.com/P1GAELF.png
Selection tool's Tool Options

I dont know how to clear this shortcuts but you can use Ctrl, Shift and Alt to override the selection mode currently in use.
Ctrl + click and drag = replacement mode
Shift + click and drag = addition mode
Alt + click and drag = subtraction mode

I've set A and S to zoom in and out, and while they do change the selection mode, you stil can use Ctrl, Shift and Alt to override it despite the mode in use.

artur89sd,Thx~
I think "R, A, S" is void shortcut keys, it is recommended to clear.
Of course, do not delete these shortcuts, the software can also be used.