I think you need to find out if Sony has a plugin or codec install for Premiere Pro
Search above leads to http://blog.abelcine.com/2013/07/30/working-with-sr-codec-on-the-f5-f55/ which may help... or, some of the other search results
well, I know how to google. I have seen your provided link two weeks ago, the problem is I don't work on a Mac but on a PC.
Sony provides plugins for FCP and Avid but not for Premiere.
Adobe wants Premiere to be known for it's compatibility with every major codec. So I expect to be able to cut my SR-Files natively without converting them.
This is a user to user forum, not Adobe support... tell Adobe what you want at the link below
Or, open a Chat session and ask Adobe support... Next link has a "Chat Now" button near the bottom