Gantt Chart Options

I would like to change a few aspects of the gantt chart, and I was wondering if these were possible:

  1. I am using the chart to plan projects over a number of months. When an item is resized I would like the item to always remain a number of months (i.e. not a month and a half).

  2. I would like the month names to be numbers. For a two year project the months would be just 1 to 24.

  3. I would like the chart to load displaying 24 months.

  4. I would also like to disable the popups.

Are these items possible? Or would they require some customization?