I going to create a new a board SETTING in the SETTING.TXT file:
https://kes.5ch.net/donguri/SETTING.TXT

BBS_ACORN=1

A setting of "1" means "!acorn" or "!donguri" in the name field is required to post on that board.

Any board can apply this to their SETTING.TXT.

If you know any board that wants this setting, please let me know and I will add it to that board.