Hi, great list.

I know a definitive list of causes would probably be endless, but I think a useful addition to your list might be 'developmental disorders'. In my case, my doctor identified a 'grey matter heterotopia' as the cause. There seem to a be a few different presentations of heterotopias which may result in epilepsy.
From my understanding, as the brain develops the grey matter is supposed to migrate towards the outside but for some people, parts of it stop early. This leaves 'faulty wiring', wherever the grey matter is left in the brain, which can trigger localised seizure activity.

As a simplistic explanation, I'm sure I've not been entirely accurate, but you can find more detailed journal articles and websites to explain it, if you want.