I am not on a windows computer at the moment, so this code is untested
This is for ahk_L not ahk_basic.
You will need to create a hotkey to start this loop. You should also make sure this runs only on the window you are indending, as well as a way to quickly exit the script, as the script may run away from you, causing you to restart the computer.
; While the physical insert key is up, send the keystrokes
While(!GetKeystate("Insert","D")) {
Send {Up}{Left}{Right}{Down}
}
If this is for a game, (and I suspect it might be) you might need to use a difrerent send mode. See the Autohotkey FAQ for info on that particualr topic.