Yes, I've attempted twice now to code a button which will allow for setting all tinymce buttons to a specific row. Unfortunately, because of the way the options are stored in a serialized array, it makes it tough to isolate only buttons from group one, or from group two.
Furthermore, I'm working on a drag and drop feature which will replace the current way buttons are added to the editor.
You can view a demo of what I'm working on here:
Thanks for your suppport, and kind words!!
Also, if you load the default settings from the tab on top in the admin panel, it will assign all group one buttons to row 3, and all group 2 buttons to row 4. I know it's not a solution, but might be a small time-saver.
Lastly, another option I am working on is a way to export the current settings, which can then be imported into a separate installation of the plugin.