How to send multiple emails from business rule

[servicetrout]

I want to understand how to send emails to a list of people, since the OOTB functionality in notifications doesn't fit my use case.

I have a business rule that triggers an event based on a condition for a single department  entry which sends a single email notification to the department submitter.

gs.eventQueue("my.UserSubmission", current);

What I want is the notification to go to half a dozen people in the department.  Please advise if this is correct. 

1) Add a function to my business rule advanced script section that generates a comma separated list of either sys_ids for the users-to-be-notified from the user table or comma separated email addresses for the users-to-be-notified.

fx() =  parm1="user1@gmail.com,user2@gmail.com,user3@gmail.com";

or 

fx() = parm1="6f20d12b6f82850023bd5965bd3ee001, 6f20d12b6f82850023bd5965bd3ee002,6f20d12b6f82850023bd5965bd3ee003";

2) Pass that to the event via a call, such as, 

 gs.eventQueue('my.UserSubmission', current, parm1);

3) In the notification make sure the "Event parm 1 contains recipient' box is checked. 

Is that right?  Or is there anything I've overlooked? 

Thank you in advance. 

G

PS, bonus questions:  

All of which begs the question is there an easy way to get the sys_id's for all users assigned a specific role?

[servicetrout]

Final function that worked for what I needed:

function getAllUsersInRole (roleName) {
  var usrArr = [];
  var users = new GlideRecord('sys_user_has_role');
  users.addQuery('role.name', roleName);
  users.query();
  while (users.next()) {
      usrArr.push(users.user.email);
  }
   // Convert usrArr to string
   var usrString = usrArr.join();
   return usrString;
}

[Community Alums]

I need to send multiple notifications whenever an asset is going to expire before 30,60,90 days. Here, I have generated seperate notification and business rules for each.

But here in gs.eventQueue(''), I have created only one event registry and can I use that single event registry in all notifications and business rules?

[Community Alums]

Please help me out in this, 

Thanks in advance