smartctrlwdeletewordorclosetab.user.js

// This is a slightly altered version of the script at 
// http://userscripts.org/scripts/show/43545
// I simply replaced
// 'w'.charCodeAt(0)
// with 
// 23

document.addEventListener('keypress', function(event){
        var target = event.target;
        if (event.ctrlKey && event.charCode == 23 
            && (/textarea/i.test(target.nodeName)
                || (/input/i.test(target.nodeName)
                    && /text|password/.test(target.type))))
            
            {
                event.preventDefault();
                var position = target.selectionStart;
                var rOffset = target.value.length - position;
                if (position != target.selectionEnd) return;
                target.value =
                    target.value.substring(0, position - 1).
                    replace(/[^ \n\r`~!@#$%^&*()_+-=\[\]{}\\|\/;:'",.<>\?]+$/, '')
            + target.value.substring(position);
        target.selectionEnd = target.selectionStart = target.value.length - rOffset;
    }
}, false);