1. There is a sub-administrator feature available when you are using Extended version or if you have low cost branding removal license.
2. By default, the system configured to use fiat value. Changing the default format will require editing the database table manually and may also require adjustment in the script. Programming skills may be required for it.
Example: by using PHPMyAdmin (generally available in your CPanel hosting account), in the database find table fields with type decimal(16,2) and updated it to decimal(16,8) where 8 here is decimal places.
I'm asking for your support on a few issues.