I’d like to display those in WordPress, and make them visible for every user, not just for admins in the admin tool bar.
the front end admin tool bar is intended to display for any user, not only for admins, in +- any theme.
As wp admin tool bar, it’s intended the bar that display on top, after an user successfully logged in, not only admins.
If a theme do not use the default wp-admin tool bar hook to display info to the user, then the hook will not fire as it’s coded and it’s required to attach it to another hook.
OK i understand the requirement:
all things about this will be rewrite and improved within 2.0.0 version, at moment it’s possible to display pm notifications on default admin tool bar: news posts or topics notifications info are ready and coded (all the necessary is already there). What’s is needed is to adjust a function to unify all these info to be used with easy by anyone into any template. This i will aim to do within 1.9.9 or 2.0.0 version or possible also before.