In Qt Designer, the only way to change the ordering of an object seems to be to go to "Tools" -> "Form Editor" -> "Bring to front" or "Send to back".

This limits the ability to layer objects and can be slow to use when editing many layers. The only obvious way is to mouse up to the menu, go through another submenu, and select the item.
For a simple example of 4 objects that are out of order – just C & B need to be swapped to get A,B,C,D:
(1) A (2) C (3) B (4) D
You may have to click C, click "send to back", then click D, and click "Send to back"" in order to get them into the desired order.

It would be easier to just right click "C" and say "Send backward", as in other UIs – if using a popup, it would be a lot less mouse movement and several less steps per action (for a quantitative estimation of how long it will take to perform these actions, look at CogTool and the GOMS method, which can simulate this and prove the significant time difference between these two actions pretty quickly).

I would like to see a more standard UI, such as in Microsoft Office or many other systems, where under right click popup menu there is a submenu named "Order" (MS Office name) or "Arrange" (Adobe Illustrator name) with four items:

• Bring to front
• Send to back
• Bring forward
• Send backward

This would save a lot of time when working with heavily layered interfaces.