What do you think about rename file by right-clicking on a tab. And that it also renames in the project files ?
I often need to rename files as I go through a project. Not you ?
You can make a tool to rename the source and make a button on the toolbar or assign a hotkey. The path to the source is %PATH, the name of the source is %FILE. You can rename and instruct to open the file again and close the old file.