Overriding libraries

I'm trying to write a module that will loosen some of the restrictions 
from the kohana library Input.php
gallery3/system/libraries/Input.php
I see the gallery module overrides Input.php with:
gallery3/modules/libraries/MY_Input.php

In troubleshooting I have added a
echo("test");
to the function in gallery3/modules/libraries/MY_Input.php and that works.
So I know that function is overriding the 
gallery3/system/libraries/Input.php  So far so good.

I remove gallery3/modules/libraries/MY_Input.php and place it in my 
modules libraries directory and and activate my module and it does not work.
gallery3/modules/floridave/libraries/MY_Input.php
Why does this not work in the floridave module but does in the gallery 
module?
Is there additional code required other than extending the class and 
renaming the file with MY_ prefix?

Next question is can there be 2 MY_Input.php files that are read and 
used by the cascading kohana magic?

Cheers!
Dave

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