John James Jacoby

Prevent all users except super-admins from creating bbPress content when inside wp-admin.
This plugin has no UI.

bbPress – No Admin

Limit new bbPress content within wp-admin to super-admins

Thorsten Ott

Simple widget to extend P2s (and other themes) functionality and display recent @replies for a logged in user in the sidebar. 
It can be also configured to show direct replies to comments or posts without the @username indication.

Mention-Me Widget

11-year old plugin and it still works just fine! Sweet!

It works!

Simple widget to extend P2s (and other themes) functionality and display recent @replies for a logged in user in the sidebar.

bbPress – No Admin vs Mention-Me Widget