Development Mode Launch Property Tags

i would like to be able to turn development mode on and off in Launch Tags Client Side. i cannot copy data elements, rules from one property to another. For context, the property with it on, has never done any extension development (but might have wanted to at some point). The property i want to move it to, has it off. 

If there is no custom extension development, why cant it be moved ?

why was it designed in such a way that simple things like data elements cannot be copied over or rules (things that have nothing to do with Extensions).