[PyMOL] Coordinates for End Groups

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Dear Pymol-users:

We are working on an interface between PYMOL and ECEPP/3 inorder to 
perform a conformational search in small peptides. We have done most of 
the dirty work, but still can not figure out how to include coordinates 
for End Groups other than the ones given in the modules/chempy subdirectory.

To make myself clear, I want to be able to build peptides that would 
contain the following amino and carboxyl end groups:
AMINO-H2
AMINO-H3+
AMINO-CH3
AMINO-COCH3
FORMYL
CARBOXYL-COOH
CARBOXYL-O
CARBOXYL-CH3
CARBOXYL-NHCH3
METHYL-ESTER
ETHYL-ESTER

Any help surely will be appreciated. Thank you all in advance.

Cheers,