Especially when a template has many parameters;
scrolling until you find the actual button to add them,
having to add them one by one and having to do so by clicking each time on the name of the template itself to get to the list again, it's confusing users.
There's already a bug about mandatory parameters not being enforced; I am not sure of the behaviour related to the order of the parameters, but it would be great if the editor could keep them in the same order they're being chosen with. Thanks :)