Lepton EDA is backward compatible with its predecessor geda-gaf and supports the same gEDA/gaf File Format Document for symbols and schematics. We are planning to support it in future since there are lots of symbols and schematics created using it. We cannot promise you to support any change in geda-gaf in future. It’s up to you, our users, to point out what feature you would like to have in Lepton.