At the end of ppssppConfig.py i found the following lines:
# Custom : allow the user to configure directly PPSSPP via batocera.conf via lines like : ppsspp.section.option=value
for user_config in system.config:
if user_config[:7] == "ppsspp.":
section_option = user_config[7:]
section_option_splitter = section_option.find(".")
custom_section = section_option[:section_option_splitter]
custom_option = section_option[section_option_splitter+1:]
if not iniConfig.has_section(custom_section):
iniConfig.add_section(custom_section)
iniConfig.set(custom_section, custom_option, str(system.config[user_config]))
Maybe this helps? I wasn’t able to bring it to work though.