A very nice Tool!
I believe it could be even more useful if it could sync single lines, that are marked with a start marker oder an end marker.
An end marker mode might help to sync single code lines having special comments appended as markers.
Harald M. Genauck
Just a heads-up: this extension does not work for currently open files in a Database project. The issue seems to lie in the Visual Studio not supporting simultaneous replaces to all open SQL (or other) documents.
I decided to submit a MS Connect item to resolve: https://connect.microsoft.com/VisualStudio/feedback/details/774024/all-open-documents-option-in-find-repace-dialog-does-not-work-for-sql-documents-database-projects