Spigot.yml

I have a few issues regarding hoppers, and in order to resolve them I would need to edit spigot.yml
Is this possible on Aternos? if it isn't, why?

Would the ability to edit certain fields indirectly, such as mob distance, hopper speed, nerfed spawner mobs, etc be at all possible in the future? These features are very helpful
For example, in the control panel there would be a drop-down menu with input boxes for the values of different things in spigot.yml