Rocket rush scenario was added in 0.18.9 (see https://factorio.com/blog/post/fff-335).

Don't you want to consider creation of new category for this scenario?

I believe that this scenario could introduce new challenges and big fun factor. Especially the initial selection/buying of items for accelerating the game is opening many options and various possible strategies. I tried the scenario and found out that it is much more difficult than it looks like and requires quite different strategy than standard freeplay. And it would be fun to compare my strategy with other players.