As far as I can tell, disabling the phpcbf.documentFormattingProvider option disables all of the other functionality, since the rest of the extension relies on the commands.executeCommand("editor.action.formatDocument") call.
The commands.registerTextEditorCommand("phpcbf-soderlind") should probably be available independently of documentFormattingProvider via the Command Palette.
As far as I can tell, disabling the
phpcbf.documentFormattingProvider
option disables all of the other functionality, since the rest of the extension relies on thecommands.executeCommand("editor.action.formatDocument")
call.