I would like to suggest a little reset button on the right of the object / variable name input field. See example in the screenshot below.
This button would reset the name to the name Mendix would have originally given to the variable. So in the example below it would reset the value to Activity.
Why would this be helpful?
When copying and pasting activities from a similar flow, but with other naming, it can be a hassle to retype or copy paste all the names. In most of the cases you just would like to give it the name Mendix would have originally given it.