I have 2 ideas for Aternos.
1. The config-tab would have an option to look into Forge's config folder to adjust mods.
2. In the mods section allow multiple mods to be chosen.. For example Applied Energistics is kindof pointless if you don't have a mod that adds powergen.
The Aternos forums are now deprecated
Learn more about this change here.
For help regarding Aternos, we recommend you to visit our support center.