I'm thinking that the simplest solution currently available is to create your own html page and to include the FME Server "app" page in an iframe somewhere inside. That would give you the opportunity to add your own branding, documentation, etc.

If you already have access to a CMS for e.g. your intranet pages, this is often fairly easy to do.

This will get much more customizable in 2019.1 see FME Server Apps: https://www.safe.com/webinars/automating-with-fme-2019/?utm_source=safe&utm_medium=email&utm_campaign=webinar-automating-2019

@david_r wow, I love that idea and was wondering if you have a sample of the basic steps to complete that?

That's a pretty good idea! Thanks.

I was considering creating a "tools" section in our intranet so that could work well. Thumbs up.

That's an improvement isn't it, thanks.

It's still missing the capability to add a friendly response message. Maybe a late addition to 2019.1 ;-)

There's not much to it, just look up "html iframe" using e.g. Google. Unfortunately I do not have any FME specific samples, but generic iframe samples are abundant on the net.