very useful gizmo. but the center sphere is unnecessary.

u can edit these shortcuts on WED's file > preferences > key section. but yes, if they come predefined it would be very useful. example,most using are Q , W, E ,R or blender shortcuts are very very useful
G + (X,Y,Z): move
S + (X,Y,Z): scale
R + (X,Y,Z): Rotation.