Merge of placeholder text and variable text fill screen

Currently, it is possible for users to add variables by adding some text on the variable text box or choosing an option from a drop-down for multi-list when creating a new page based on an existing template (custom template for example).

However, placeholders are only editable on the page's next step, in edit mode, while variables have a "pre" editing page but only for variable fill options.

It would be pretty useful to have a way to fill everything in a single screen, so variables and placeholders could be filled out by the user in one shot and cause less confusion as to why there is a second screen taking the users to the actual draft of the page.