I would love to see some in game settings that could help tone down the effects that can trigger an episode. I've had several friends who have had to stop playing MMOs due to PE, and their bad experiences in previous games has made them unwilling to try SWTOR .
If there were settings that allowed for us to turn of the "cause seizure" effects, it would go a long way toward getting at least some new subscriptions (and preserving existing ones, like Hedda's).
There have been other games with sliders to reduce the flashy effects... if I remember right City of Heroes had something like that as well and it worked great - my friends were able to crank that down, play the game just fine, and not miss out on anything other than pain and suffering.