I was thinking more that when you configure the find replace, you could choose the run-time target as, e.g.,
"Current file" - at run-time this would find and replace in whatever is the current file.
"All HTML files". At run-time this would find and replace in all HTML files in the current ebook.
"All CSS files". At run-time this would find and replace in all CSS files in the current ebook.
"All files". At run-time this would find and replace in all files in the current ebook.
etc
And you could also automatically execute the saved find replace when you load it.
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