Have you exhausted the permission options?
If you don't give "Edit" access to any users - other than Admin - the actions menu shouldn't display.
However, if you have some modules that need certain permissions you could customise your Containers with some server side code.
For instance - the logic might not be perfect but something like this:
<% If PortalSecurity.IsinRole("Administrators") %><dnn:Actions .... > <% End If %>
This would only add the actions menu to the control tree if the user was in the Admin role.