Is your feature request related to a problem? Please describe.
When I have to update the mentions using the [p]mentions command, I would have to keep mentioning those who want to be mentioned which may annoy them. Creating a temporary channel just to change it may not always be an option if you have people in admin roles, who can see every channel.

Describe the solution you'd like
Inputting the user or role ID instead of directly mentioning

Describe alternatives you've considered
Can't think of any

Who will this benefit
Staff, as they may not enjoy being pinged for no reason