Ok... Pushed with the same features that worked before, which means:
On Facebook ready: it is implemented using setTimeout for now to maintain compatibility (very bad, I know). This trigger will disappear in the future.
Is logged in to Facebook: OK
Request login: OK
On Facebook login succeeded: OK
On Facebook login failed: OK
Request logout: OK
On Facebook logout: OK
Request user score: OK
On score received: OK
Submit score of int(n): OK
On score submit success: OK
Request Facebook scoreboard: OK
On score info arrived: OK
Projects that used to work with the extension still work without any changes. I will take a little break now, and will fork Ludei's Construct-2 GitHub and try to integrate what I did there.
Again, any suggestions or questions, please talk to me.
Thank you. Hope it helps.