Thanks for the answer and implementig my request.
I've got additional idea to add into Multi-Rename tool:
Right now we have 4 fields in option "Search & replace" to replace 4 words (letters) in the filename in the same time. Could you maybe change this option to one field where we can describe even 20 words (letters) separate by "|" or ";" ?
I found this idea when I had to rename a lot of files with Polish letters to filenames without them.
In PL we have 9 special letters, I had to repeat this activity 5 times, 9 for lowercase and 9 for uppercase letters.
I was looking in online documentation about possibility to replace more but I didn't find.