Adding a 2nd folder is not supported, since it would instruct EventSentry to monitor the same folder twice. The best approach to suppress these false alerts from Malwarebytes would be to create an exclude filter so that these alerts aren't forwarded to an email for example. The advantage of this approach is that the changes to the "drivers" directory still get recorded to the database.
I included a screenshot of what this exclusion filter could look like. You may have to change the 2nd content filter if the file that is being added is not mbamswissarmy.sys:
You can put this exclusion filter into any package that is assigned to the host where these alerts are generated, or you can create a new package.
I hope this helps, please let us know!