Ability to order fields on Landing Pages

1) Custom fields list when adding to a landing page is not in alpha order. 2) Not able to change or choose the order of custom or contact fields as they appear on the landing page, either by alpha, randomly, or by required or not required. I can't find any information in Help about if this is possible and, if so, how to do it. These changes would make the page a little more flexible for us and easier for the recipients' to understand and use. As it is, it's frustrating. Thank you.