$(Trac).submit(check);

What about add a function in trac for checking if user is submitting a
ticket about jQuery UI?
like:
$("form").submit(function(e){
if (/draggables|dialog|datepicker|.../i.test($("textarea").val()) ) {
if (confirm("You are submitting a UI-related ticket, and jQuery UI
has its own tickets system....")) {
...
} else {
e.preventDefault();
}
}
});