bbpress just uses wordpress login.
But since you can stay logged in, any plugin which would log users would need to activate on each page and do a database write, which might be site affecting (or not!).
Any wordpress login visit plugin would do the job, but I suspect there are precious few – but google around and if you find one with a shortcut to display it should be easy to hook up.
Oh you’re right i thought it was specific to bbpress, if it is standard wordpress login i will find a plugin for that thank you 🙂
let us know if you fix it
i will soon work on it 🙂