I am sincerely sorry for my late responses. The v13 feature set has been fixed already, and I am not going to add or change any more resources because we are already asking translators to translate the resources.
For future versions, it is possible to add your feature. However, I am afraid that I am not generally good at understanding English. Your feature seems so complicated that I had a hard time figuring out why this feature is so important. Can you please explain (with simple words) what is a good example when this feature becomes useful? The screenshot (http://www.freeimagehosting.net/8zvbw) doesn’t explain why the feature is important. Please write as simple as possible.
Also, can you try the new multiple-selection editing feature of v13? With this new feature, you can easily select multiple selections using CTRL + SHIFT + A, and then you can replace the strings just by typing. In my opinion, the multiple-selection editing is much more easy to use.