Is it possible to have the @confirm dialog with a custom title?
Perhaps it could work with syntax like @confirm:<message>|<positive text>|<negative text>||<title> where the extra pipe character is used to delimit end of buttons (undocumented fun fact: currently after the "positive" and "negative" buttons you can add infinite number of extra buttons, I don't know if that's intended.)
I don't think there is a way to do that. Using scripting you can create dialogs with more (almost infinite) customisation, or to create a script command which lets you use custom dialogs within normal commands in place of @confirm.
Thanks for confirming (no pun intended) there currently isn't a way for @confirm to have its title specified.
Hopefully this possibility will be added because in my use case using full scripting just for the title would be like using the hammer to push the thumb-pin. 