3ds Max :: Rotate Objects At 90 Degrees

In my work i rotate objects mostly 90 degrees CW or CCW and I always wanted to make a hotkey for it.. There's a command in 3dsmax called "RotateCW" for it, but it doesn't work when more than one object is selected..  also i tried doing it with script :
 
macroScript Rotate90Z
category:"DragAndDrop"
toolTip:""
(
(
rotate $ (angleaxis 90 [0,0,1])
)
)
 
but this rotates objects only about their pivots even if option "use selection's center" is chosen and even if objects are grouped - it rotates objects in the group independently but not the group as a whole. It's completely inappropriate.
 
Normally i select objects (or a group), then go in "select and rotate" mode, type in 90 degrees and  it works well. So i'd like to imitate this behavior by a script or some other way to set a hotkey for this set of actions..