Add ability for optional command inputs for actions

When IBM i commands are created they can have optional parameters that someone can set but not always see unless F9 is pressed.

When I create and use a custom action based on a command that fully prompts the user with many inputs the Execute and Cancel buttons can be pushed off the visible window, causing me to scroll down.

I don't always want to fill out some of these parameters, especially if I give them defaults.

What I would like to propose is "something" that can be identified to find the point in the keyword list that the Execute and Cancel buttons would go and then the remaining optional keywords.

An idea I thought of already is something like /%%RUN%%/.