Shamim's Plugins

bbPress roles are not wordpress roles. So it doesn’t show here.
If you need custom role you can use user role editor plugin. Do not forget to set those as wordpress role.

Currently not possible

1. Is it creates problem with all roles or only certain role?
2. In which role you are logged in?
3. To which role you tried to send a message?

By default every user query for new message every 2 minutes. You can change this value and use a larger number. Please follow https://www.shamimsplugins.com/support/topic/question-wp-json-front-end-pm-v1-notification/#post-27140

(Wait 24 hours to see the reduced request number)

For email you mean stop sending email when they receive a message in website?

You can achieve this my running a cron job and query messages using FEP_Message_Query which is created more than x years ago. Then archive those messages.

You can use fep_filter_user_name hook to change name as you like

By default it is not possible but this plugin has hook which we can use to achieve this feature. It require custom code.

We have a shortcode for that to easily integrate. Please see https://www.shamimsplugins.com/docs/front-end-pm/shortcode/fep_shortcode_message_to/