I want to do almost exactly this. It's been an obsession of mine to use a question mark in file names and the fullwidth question mark is the best substitute character I've found. I've copied and pasted this code into my toolbar in customize mode and nothing happens. I have no idea what I'm doing wrong.
My next goal would be to create user command I can apply with the keyboard that doesn't need a button.
When I I type Alt+65311 I get ▼
My ultimate goal is to create commands for the colon and forward slash substitutes I've found
I could not find code in the Dopus manual for inserting characters.
This is intended to be used while editing a file/folder name (Rename from file context menu or F2). Copy the code and go to Preferences / File Operations / Renaming Files / Control Keys ... Click the paste toolbar button from within preferences. Note the shortcut key assigned to it. Use this shortcut key while editing the name of a file.
If you would rather have a button add it without entering edit mode. This will always add to the end of the name.
AutoHotkey is an excellent and more flexible tool for such things: you can insert any character not only in file renames dialogs, but also in search bars or even outside of Opus. And then you could even have helpful popups to pick from
or simpler tooltip reminders