Can :copy (F5) be modified so that it shows the conflict menu the same way it is shown when we yank and the past? Currently it only shows File "name" already exists on the commandline.
File "name" already exists
:copy behaves differently from putting, but you can put from command-line (source):
:command! cp :yank | winrun , put
:command! mv :yank | winrun , put!
Although :put doesn't accept file names.
It works, thank you.
Is there a way to avoid switching back and forth between the panes?
No, there isn't.