This script can be used to help duplicate the keyable attributes from one object to another object.
And, users can add, edit or delete attributes by the mz_dupAttrUI. 


Instruction:

1. put it on your Maya script folder.
...Documents and Settings\user name\My Documents\maya\2011\scripts

2. run Maya.

3. type "source MZ_dupAttr.mel; mzDupAttrUI;" in your maya script editor window or the command line.

4. hold middle mouse button and drag the "source MZ_dupAttr.mel; mzDupAttrUI;" to your maya shelf. so, you can use this script repeatedly.