AppleScript Help

I'm not sure I have time to talk you through it like a 5 year old, but here's the bare bones of an AppleScript:

Code:

--make sure your target app has focus
tell application "TextEdit"
   activate
end tell

tell application "System Events"
   repeat 10 times
       keystroke return
       delay 1 --optional delay between keystrokes
   end repeat
end tell

Start with a TextEdit document open - I've used TextEdit for this example since I don't have FortNite. I think the code is reasonably self explanatory.

As far as I know, there's no way of making the shift key presses continue until the shift key is pressed a second time. However, the code above at least means you can do multiple keypresses with an optional delay.

As a side note, many years ago (we're talking late 90s!) I had a job where I had to open a huge bunch of large Illustrator files simultaneously (it's a long story). Each one popped up a dialog when opened which needed the return key hitting to continue the opening process. Since I had no idea about scripting at the time, I selected all the files in Finder, dragged them onto Illustrator and wedged the return key down using two books and a banana, then went for my lunch. When I came back, all the files were open. Not all automation requires code! ;-)

Good luck.