Well like Mansikka is faster and because i reply from my phone i don't want to make a new post xd.
So,like he said you can edit every cfg you want when you open it with notepad++ or some other software like this.
All your cfg or here autoexe.cfg are in your etmain folder.
If you want to make a cfg then just edit the basic one (etconfig.cfg) then rename it by the name you want (for example : tillidus.cfg). Be sure to save it as .cfg and not as .txt in your etmain folder.
Once you are in game then just do /exec tillidus inthe console.
It will run then your new config.
Hope it will help you.
If you still need help feel free to ask anyway.