Hi sazearte, it definitely is possible to add such examples but probably will take some time untill I get to it. In the meantime you could already take them from the demomaster which you see in the linked video. It can be found over at Demomaster application framework with wxpython navigator Not sure how well it does work for recent versions of P3D though.
As soon as I get time I’ll take a look into vegetation, terrain and water as those are things I personally need too.