I'm new in this openbabel world and I did not have time to check all the full capabilities. Hopefully in the near future 'll be able to contribute.
This is a list of features that I've seen in other cheminformatics sofware that It seems to be not available in Open Babel. Maybe some of them are already available.
Some of them might be very dificult to acomplish but it may be useful to have a diection to follow:
1 - Export molecule to a graphic file (jpg,gip,vectorial file....)
2 - Molecule to name and Vice versa. Ability to generate IUPAC names from molecules
3 - Convert SDF or molecule group into EXCEL, HTML (requires to be able to generate the appropiate GIF/JPG),CVS,.....
4 - Generate web XML with image inside to easy web display.