What are the current requirements for obtaining an ED Visa in Thailand, and do part-time study options still exist?

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There is no ED visa for studying part time :/ The way the MOE has their rules written if you're on a program lasting longer than 6 months you need to study 5 days a week 2 hours a day minimum to get extensions of stays at the immigration office. Now obviously some unscrupulous schools just pencil whip the time sheets you turn in to show you studied those hours.

I know there are schools out there letting their students study a measly 4 hours a week but the student turns in time sheets for their extension showing far higher hours attended >:(

Most of the better schools out there run module based lessons, where you study 3 hours a day, 5 days a week for a month per module.

What are you wanting to study to get an ED visa?

ED visa is a visa you can get when you follow an Education, this can be Thai language, another language, Muay Thai boxing, Scuba Diving, i have seen Thai Cooking so the course requirements depending on the institute where you going to study.