At present WriteFreely federates properly with at least Pleroma instances, but following an instance running it has to be done manually through the search bar. Is there any chance of a remote follow button being added?
I think so.
The biggest obstacle for this feature is inventing a more user-friendly follow flow. I’d rather keep the current behavior than e.g. copy Mastodon’s UX and end up confusing people.
Also, part of inventing a better flow will involve developing it alongside Read.as, and making the two platforms work seamlessly. So this feature probably won’t happen before we’re able to spend more time focusing on that project again.