What settings are needed for autorenaming when copying?

When files are copied and a file name is already in the copy destination, I would like the incoming file to be get a (1), etc. suffix.

There is a Rename New (All) option in the dialog which appears when Opus asks what you want to do with two files of the same names.

You can also add WHENEXISTS=renamenew to the Copy command to make it automatic without any prompt. You probably would not want that all the time on every method of copying, but could set up a special button/hotkey, or make it so copying while holding a key down will do it that way instead of the normal way.