can I copy for example 1 file to many folders?

[white]

It would be very easy to change, but wouldn't it be confusing? Maybe I need to change the wording of the option?

The text "Copy to all selected folders/links in the target panel" doesn't make it contradictory. Nothing there says subfolders can't be created under them and that the option "Keep relative paths" should be ignored. Users check "Keep relative paths" to keep the structure, whether the target is one folder or many. It's not confusing that subfolders appear; it's confusing that they don't. Disabling it silently is what's confusing.

[Dalai]

It's not confusing that subfolders appear; it's confusing that they don't. Disabling it silently is what's confusing.

I agree.