This is my 3rd attempt at posting this so here's hoping.
Upgraded DEV environment to BI 4.1 SP6 patch 1 and all went well.
Added some of the new Document Input Controls to an existing document and they work as expected in WebI.
Wento test on an iPhone 5s running iOS 8.4 and the Document Input Controls don't appear.
Normal Input Controls, now known as Report Input Controls, show up and work as expected.
It would appear the Business Objects Mobile does not support Document Input Controls or it has been overlooked as a new feature in WebI that needs to be supported in BObj Mobile.
I've also tested this on an iPad 2 running iOS 8.4 and they are are no show there also.