[KevinH]

Have you actually tried the RERenamer and the normal Rename functions that works on sets of files?

And BookBrowser only gets a keyboard input cursor when in rename so I am still not sure exactly what it is you are asking for. Please be specific and show annotated screencaps as to what you think should happen.

You can quickly rename all selected files to partXXXX.xhtml numbered if you like using Sigil's regular rename tool but since the file names themselves are not user facing, why bother. Or you can use Regex in the RERenamer to select and capture parts from current file names to create new file names.

Perhaps you are trying to do everything using keyboard shortcuts and never use the mouse?

If so you should note that shift-tab cycles the focus among existing widgets. So on my machine I can do the following:

Click on first file to rename:
Command-Alt-R
rename it and hit enter
Shit-Tab, Shift-Tab, Shift Tab
Down Arrow
Command-Alt-R
... repeat

But wouldn't it be faster to:

Click on first file to rename
Command-Alt-R
rename it and click on the next file to rename
Command-Alt-R
... repeat

But again there are many more efficient ways to rename a number of files. Just select a block and right click to Rename the block (and number them). Then use ReRenamer to use regex to to rebuild the files from the pieces any way you want.

That is the whole point.