Double E : easy rotate. Easy rotate is a really powerfull way of optimize animation time. With double E (like double clic but with E key) you enter in a mode where while you drag, the object is rotating.
Drag vert. and horiz. to rotate in view axis X and Y
Shift for slow drag
Ctrl for X and Y local rotation if you go Verty. or Horiz.
Ctrl + Alt for visual clockwise rotation (view Z)
RMB for exit the rotation mode.

Easy rotate : finally intuitive rotation in Maya. No more intensive rotation ball clic and axis picking.
Alt+Shift+Z : open a window with the custom attributs of the objects

Get acces to all custom attribut quickly
Alt+W, Alt+E, Alt+R: Reset Translate (Alt+W), Rotate (Alt+E), or Scale/custom attr. (Alt+R)

Alt+X : select the mirror object

Alt+S : select the content of a set, from an object or Set. If you run this a second time, it will se;ect the parent set.

Alr+Shift+S : Select all Character

Alt+C : Proximity Controller : Allow auto hide far controller from mouse.

Alt+Shift+F1

You can then change the hotkeys :

If you change it, fill by A for Alt, C for Ctrl, S for Shift , separate by - and add the key. E.g. AS-D (Alt + Shift + D)