I find your terminology of a "master source/source details" very confusing when what you really mean is a "source/citation". in places, both in the application and in your RootsMagic 7 book, you sometimes call a citation a "citation", but at most other times you call a citation "source details".
Why don't you dispense with this confusing terminology altogether and call a spade a spade? I.E. especially for FTM users, and all others who are used to calling a citation a citation, please dispense with this confusing term of "source details" when you really mean a citation.