I know the current facebook unity SDK has zero support for PSM, but has anybody any idea how I might login without using it on this platform? My game uses a facebook signin at startup and it's the only bit that isn't working at the moment, the rest of the game works perfectly so I'm painfully close. Any suggestions would be welcome
try using Application.OpenURL It doesnt have a facebook popup but it opens the webpage in the web browser....You can maybe start from there http://docs.unity3d.com/ScriptReference/Application.OpenURL.html
You could get in touch with a plugins company / maker, And ask them to make a custom login for vita psm, it will most likely cost you. I've mentioned plugins for vita psm to prime31 a few weeks back, he said if there is enough need and ask for them he may do some