Progress Interval for Task

I have found that having users slide the progress slider left and right with an increment of 1 is hard for them to get the right % if the task bar is short.

This is working to increment the progress in intervals of 5…is there another way to do this with the API?

gantt.attachEvent("onTaskDrag", function(id, mode, task, original){ if (mode == gantt.config.drag_mode.progress) { task.progress = 5*(Math.round(task.progress*100/5))/100; } });

there is no built-in setting for a progress interval, so limiting it from a onTaskDrag handler is a only way