Help needed with simple rc program for 51515

[whitepen]

So I was working on a simple rc program on my computer today with my new 51515 set and was trying to make it rc using the keyboard (up arrow=forward down arrow=reverse left arrow=left right arrow=right) But it is hard because there is no "when no key pressed" block to my knowledge. The robot I am using is THIS. Any help would be greatly appreciated. 

[bruh]

So, I know that it is a bit late to reply to you lol. However, you can use a negative to do what you wish.

If you say "(not) all keys pressed" it will stop. In order to make it go forward, backward, etc., you need to give it certain commands, e.g., "motor A rotate forward, motor B rotate backward"