Input.GetAxisRaw with delete and shift

Hello,

I'm trying to get a combination of shift key and Delete key to produce a result in my game, using Input.GetAxisRaw(). I have defined both shift (left and right) and delete as Axes in the Input manager.

 Axes->Delete
 Name:            Delete
 Positive Button: delete
 Gravity:         1000
 Dead:            0.001
 Sensitivity:     1000
 Type:            Key or Mouse Button
 Axis:            X axis
 Joy Num:         Get Motion from all Joysticks
     Other values are blank.

In the script code called from Update() I have the following:

 if (Input.GetAxisRaw (Keys.Delete) != 0)

{}

Keys.Delete = "Delete" from a Keys class to just eliminate typos.

This works fine if I just hit Delete on its own. However, when I hold down shift and hit Delete, the Axis condition is not fired. I verified this with debug breakpoints too.

Is anyone else able to create this issue? Could this be as a result of the Unity hot-key for shift+del causing issues when running my game in the editor? Is this a bug potentially? Did I mess something up?