Currently, the only ways to edit the controls and properties of an object are:
Use the formula bar
Use the "Properties" tab
Use the "Advanced tab
The problem with the above is that they all require editing the properties and formulas individually. The "Advanced" tab gets a little closer to being able to quickly update the properties except it doesn't always seem to show all of the properties and if the property isn't already a formula, you have to enter one in the formula bar first.
It'd be awesome to have the ability to open all of an object's controls and properties in a single text box displayed in a JSON or XML-type format. This would allow for users to be able to go in and quickly edit all of the properties in a single place, and better yet is that it would allow the copying and pasting of data from similar objects. As is, editing something like all of the colour/fill formulas on a dropdown box or combo box is a bit tedious, but having this as an option would remove that tedium.
Personally, I'd like to see it so that it doesn't update the canvas until after a button is clicked to accept the changes simply to allow for bulk updating without the application constantly trying to apply changes and slowing down the editing.