The auto-opt tool should have a "best available" choice for force fields -- this would use MMFF94 if it can, and UFF otherwise. (If proteins force fields like AMBER or CHARMM are implemented, these can also go into the logic.)
Some code in openbabel to scan the atoms in the molecule and return a best FF would be nice for other programs that use OB? Would this be better implemented there?
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Some code in openbabel to scan the atoms in the molecule and return a best FF would be nice for other programs that use OB? Would this be better implemented there?