Could you add a feature that premium accouts can auto login like FastLogin?

[Simba98]

I mean, the plugin allows offline mode player login and then use in-game auth plugin to login, and auto login for online mode player, just like FastLogin.

Well, you said FastLogin will not support Sponge, I'm not nure whether FlexibleLogin has possibility that it support this feature. Maybe the reason why FastLogin don't support Sponge is that Sponge don't offer some important APIs. Or it could. Although I think it is possible through Mixin, using Mixin is a difficult way to support this feature.