Shortcuts for Move ipelet

Yet another question from a newbie:

I was trying to define new shortcuts for the Move ipelet. The inbuilt shortcuts work, but something like the following does not.

shortcuts.ipelet_1_move = "Right" -- right
shortcuts.ipelet_2_move = "Left" -- left
shortcuts.ipelet_3_move = "Up" -- up  
shortcuts.ipelet_4_move = "Down" -- down

Is there any way to use the regular arrows / page-up / page-down keys as Ipe shortcuts?

Thanks,
Mandar.