Every now and then we find it necessary to switch between local, object, world, etc for our rotate, translate, and scale tools. A quick and easy way is hold down the shortcut key and then the LMB.
For example
w + LMB lets you change the move settings
e + LMB lets you change the rotate settings
r + LMB lets you change the scale settings
Don't be satisfied with what you can do but rather strive to do the things you can't do!
Exceed Expectations!