Thanks for the feedback and votes. This feature is in-progress.Tori commented
Under review since december 2015?? This a MUST feature! But it's obivously not high the list!
Thanks for the feedback!
When you open documents that you own in OneDrive and OneDrive for Business, we now open in edit mode by default. Documents shared with you still open in Reading View. We are in the process of rolling out default-to-edit for SharePoint libraries, stay tuned! :)