I am not too much for ideas but yes for add features that i saw in other engines that i am used to it.
I use Cryengine 2 and 3 a lot for my personal and novice creations or maps not even mods (i made my country in a 4 by 4 km size and created some buildings just using solids from the engine itself because i don´t even know how to use Maya or Autodesk, etc, mostly because my main language is Spanish and Cryengine is in English and the technical words are hard to understand for me and never learned how to use those programs and the worst part is that i have Autodesk and never touch it...so yes i am a noob in so many senses lol but i try to learn on my free times using common sense and test/error of course).
So Cameni just take a look in how Cryengine works because for my point of view it is a friendly user engine with cool and simple tools for add whatever you want or place objects, etc.
An cool idea for a presentation of Outerra engine could be something a little bit "special" and more for the masses and not just for "a couple" of people who likes flight or other kind of simulation.
If you add the Moon i am thinking about the mission of the Apollo 11 to the Moon. Imagine giving the opportunity for people to launch in the Apollo 11 from Cape Canaveral and all the way to the Moon watching the same sequences in a first person perspective (also with the same views as everyone remember). Watching how the Moon is getting closer and closer and then landing in it using the same views as in the real video could be great. And then when you arrive you can see the entire Earth from there with incredible quality.
Of course you have to recreate the launch platform, Saturn 5 rocket,the Apollo 11, the lunar module, particle effects, clouds, the Moon, the exact distance from Earth and more...lot of work of course.
But i think as a presentation would be fantastic...imagine those people who tried to recreate it in flight simulators or just using CGI but now having the opportunity to interact and see it on fully glory. And of course this is going to show the real potential of the engine.
I found things similar in you tube but always with the same result...or bad quality simulations as this:
; or more or less what i want to see but again i can count the pixels lol :
You can find videos of the actual launch and the Moon landing on you tube + fotos. (i can search that for you if you take this in consideration with no problems at all)
Of course when you want to show the potential of the overall engine you need tons of material. Add some vehicle "samples" to show how physics works in different situations (land, air, water and space in this case but mixed with the sense of gravity that the landing is giving to you -it is more like a shake feeling of course-)
This engine is capable for everything in my eyes now and i can think in more things.