User Key for built in Features?

[CH3791]

Righteo, so I found that if you return the key id number, you can get the "original key".

For example,

Code:

KEY K_PAREN()
BEGIN
RETURN 17;
END;

converts the () key into the xtθn key.

However, I still don't know how to access the shift or alpha versions of those keys. Is there a way to modify the key ID to do so? Like K_SHIFT(17) or something?