@gorangrooves I realize this is an old post, but I have been going about it simply by using a custom UI look and feel and drawing the widget to show the rounded value, even though under the hood is a slightly different value. Seems to work so far, will double-check in logic
g.drawAlignedText(Math.round(val) + "" + obj.suffix, [a[0], -0.15*a[3], a[2], a[3]], "centred");