Will RomTerraria work with the Mac/Linux versions of Terraria introduced with 188.8.131.52?
Not at this time. Soon.
Are you planning on making RomTerraria work with the Mac/Linux versions?
I'm currently working on it. When it's done, you'll need to copy your Mac/Linux executable over to a Windows machine and patch it.
Do you have an ETA?
Not at the moment.