How to change Scrypt parameters?

[ir.hn]

How do you change N, P, etc on modern scrypt parameters?  In tenebrix code at the end of scrypt.c there was a place where each of these was defined like:

N=1024
P=1
etc.

In modern scrypt and litecoin these values are missing.  Where are they changed?

Will donate a bit of bitcoin for any help!

[ir.hn]

lets do .005 btc to whoever helps

[ir.hn]

bump

[ir.hn]

Talked to the creator of scrypt and he said litecoin hardcoded the 1024 into the code and cannot be changed.  Have to use tenebrix or fairbrix code to adjust the value