We don't have a way to turn this off as it is a standard Windows behavior for renaming on the 2nd click of text. It works the same way in Windows Explorer.
I can offer you a bit of a work-around in that if you click the icon instead of the text in the tree, you will not get the rename field to pop-up. If you can overcome your muscle-memory, that may be some small help.
also, the edit feature icon should be available from the context toolbar that comes up by your pointer when you originally click on the feature on the model. the second click in (and travel to) the feature tree is not needed.