The entire Repository module is template driven, so you have complete control over the display

1. to remove the Moderate button competely, edit the header.html file for the template you're using and remove the [MODERATEBUTTON] tag

2. each control has an ACL which you can use to control who can see what controls. If you only want the Administrator to see the Moderate button, edit the header.xml file for the template you're using and add a Roles setting for the MODERATEBUTTON tag and set it to "Administrator".

and of course, you can easily reverse those changes to return the module back to it's default configuration. The changes control the display and do not affect functionality so you can switch back in the future if so desired.