As you say, this is a Tortiose function, not part of the svn core libraries.
I think the best way to do this if you are using the svn command line is to specify the files you want to commit. I assume that you are using svn from some kind of script, so it should be executable. You can specify the files you want to commit, or create a text file with a list of files and use the --targets command to specify a list of files.
You could, if you wanted to create a list of all the files except those in question, and create an alias that would commit -targets mycommitlist.txt or something like that.
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