Limit Admin user privilege?

Hello,

I'm writing a small script that will allow a user to run it from their desktop for them to be able just to "add a secondary email" on a specific mailbox.  These users are not a member of any admin group in exchange and adding them to the existing group is not a idea given the it has more rights that they need to have. 

Basically, all I wan't is for these users to execute the "set-mailbox"  and "-emailaddresses" cmdlet

Is there a way  to achieve this?  

Thanks,

Lorenze