I would like my lights to come on fast but shut off slow. Is this possible?

Only if you use a program or two.

To take that a bit further, create a scene with the ramp rate you desire for the turn off ramp speed and set the controllers to that ramp rate.  Then create a program as follows:

If 
   'Control_A' is swiatched On
   or 'Control_B' is switched On

Then
   Set Scene 'MyScene' FastOn

When you turn the lights on with either control, thety will start to ramp up but the program will see the control on and issue a FastOn to get them on full.  When you turn them off, the scene will just ramp off at the rate you set.

 

Hope this helps.

 

-Xathros