If the demand for the ability to edit the spigot.yml increases we might consider this.
Demand for editing spigot.yml is already pretty high, searching "spigot.yml" "aternos" gets you 169 results, a lot of them wondering where spigot.yml is and how to access it.
I'm also pretty sure that there are a lot of Aternos server owners out there that silently really want to just edit a couple settings in the file, but can't and don't know where to ask for access