OSX - move, rotate and scale with W E R

I’m using Unreal Editor 4.4.3 on OS X Mavericks.
Navigating in the Perspective Viewport can be done with WASD.
W is forward, E is up. Unfortunately, these keys are also used to move and rotate objects. So when I press W or E, I never know if I’ll move or select a different placement option. Is there a workaround or is this a Mac bug? Because I do not have this problem on Windows.