Yes it's possible. You could write a jsPDF plugin method to use.

One quick example is this:

    (function(API){

    API.myText = function(txt, options, x, y) {

        options = options ||{};

        /* Use the options align property to specify desired text alignment

         * Param x will be ignored if desired text alignment is 'center'.

         * Usage of options can easily extend the function to apply different text 

         * styles and sizes 

        */

        if( options.align == center ){

            // Get current font size

            var fontSize = this.internal.getFontSize();



            // Get page width

            var pageWidth = this.internal.pageSize.width;



            // Get the actual text's width

            /* You multiply the unit width of your string by your font size and divide

             * by the internal scale factor. The division is necessary

             * for the case where you use units other than 'pt' in the constructor

             * of jsPDF.

            */

            txtWidth = this.getStringUnitWidth(txt)*fontSize/this.internal.scaleFactor;



            // Calculate text's x coordinate

            x = ( pageWidth - txtWidth ) / 2;

        }



        // Draw text at x,y

        this.text(txt,x,y);

    }

})(jsPDF.API);

And you use it like this

var doc = new jsPDF('p','in');

doc.text(Left aligned text,0.5,0.5);

doc.myText(Centered text,{align: center},0,1);