Edit: I realized shortly after I posted that the code mod I made would actually send Shift + Whatever Key to WoW2 instead of the key itself as you wanted. You'll have to adapt the key lists and modifiers from above to get them working that way. I'll let someone more competent look over things and give you some better advice :P
All of my keys I've done to send to specific windows I coded each single key like <Hotkey Shift ScrollLockOn 1> <SendLabel w1> <Key 1> There are ways to do it without having to do each one manually, its just above my scripting abilities. If it might be of any use I'll leave what I came up with below.
Code:
//-----------------------------------------------------------
// DEFINE HOTKEYS FOR ALL KEY COMBINATIONS THAT WILL GET
// SENT TO BOTH WOWS. ADD MORE KEY COMBO'S IF YOU WANT.
//-----------------------------------------------------------
<Hotkey ScrollLockOn A-Z, F1-F12 except W, A, S, D, Q, E>
<SendLabel w1, w2>
<Key %Trigger%>
<Hotkey ScrollLockOn 0-9, Plus, Minus>
<SendLabel w1>
<Key %Trigger%>
<Hotkey Shift ScrollLockOn Plus, Minus, 0-9>
<SendLabel w2>
<Key %Trigger%>
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