Yep, no custom ROM as of yet. All I've managed to find is a modified version of the official firmware. You can check it out here: THL w100s Modified ROM.
I do hope that we'll have custom ROMs for our device soon.
I found some modded firmware for our device, here are the links: (REMEMBER: I just FOUND them, I did not make them so I won't be able to answer any questions regarding bugs.)