We were told that in order to create custom tabs in Web Access, one has to be on the web server itself, and logged into the repository as a Windows user who is an administrator on the web server.
This requirement seems... intense. I'm sure there are good technical reasons behind it, but it makes it a pain in the neck (to say the least) to create custom tabs because most of our clients don't use Windows accounts. So we always end up having to create the custom tab on our sandbox environment, export the user attribute, edit the XML and then import it to the customer's environment.
Are there any plans to make this more friendly?