If you go to the disABILITIES FAQs thread, there are some links to past threads in post #3. They are listed in categories alphabetically. Under Epilepsy, you will see 2 past threads that will be helpful.
There are no rides that WDW specifically lists any warnings for people with seizures. In general, there are no rides/attractions to avoid unless you know specific triggers the people have and know that those attractions have those triggers (one of the threads in the disABILITIES FAQs thread I talked about above has rides with flashing lights).
Some of the most important things to prevent seizures are avoiding dehydration and avoiding sleep deprivation. Both of those things lower the seizure threshold, which makes it easier for a seizure to occur.