Can I extend my multi-entry Non-O visa in Thailand for additional stay options?

@Jamie ********

let's try to sort out what you're talking about

On a year-long, multi-entry Non-O visa <- the kind you bounce out and in on every 90 days people routinely get 15 months out of it :O And none of that was an "extra" 90 days. You simply bounce out and in one last time before the VISA expires and you get another 90 day entry (taking you to 15 months of stay on a visa that lasts a year) AND then you can apply at the immigration office to extend that last entry by 60 more days under the visit family clause for 1900baht taking you to 17 months of stay in thailand on a visa that was valid for a year.

You are NOT able to pay and get another 30 days though, you can't get a 30 day extension from an immigration office on a Non-O visa/entry.

to

Don't you want a one-year extension of stay on the visa? That's much easier than looking for short-term gimmicks, and then starting over (I assume) with a new visa application.