To my happy surprise, I found that with the combination of the latest version of Microsoft Office 360 for Mac and the latest Mac Operating System OS X El Capitan, it is now possible to directly enter Unicode Devanagari in a Word document with the Devanagari - QWERTY keyboard layout.  Previously, I had to enter Unicode Devanagari in something like TextEdit and then copy and paste into a Word document, but was not able to edit it in the Word document.  The new development of software has happily changed that situation.  Hope this information will be of use to some of you.  Best,

Madhav Deshpande