+ printf ("To apply changes to these parameters: %s\n", r);
+ printf ("run '%s reconnect %s'\n", app_name,
+ skip_prefix (command.common.account));

Nitpicking: if you put the command on its own line, with no punctuation, it'd be even easier to copy/paste (triple-click + middle-click, in most terminals). I'd personally format it like this:

    To apply changes to these parameters:
        badger, mushroom, snake
    run:
        mc-tool reconnect example/sample/xmplr

r+ with or without this.

mergèd, hooray!