If I wanted to include my own music, would it be as simple as placing a .ogg in the RuntimeData >> Music folder?
That is the case for AI War, where it just plays a custom loop of all the tracks in the music folder; but that does not work for AVWW. If you want to add music, you'll actually have to replace one of the existing tracks. At that point your replacement track will then play during whatever contexts the original track would normally play in.
Similarly, is it that easy to add custom sprites, ground textures and back drops?
For all of the above, you can replace existing assets with textures of the same size, but you can't add new ones. And actually, for repeating textures for things like backgrounds, you don't even have to have the replacement asset be the same size as the original. For things that are sprite dictionaries like the particle effects or character art, though, you want to make sure that the frames are in the same locations within the image and are of individually the same size.
Tip: In the game development subforum of the arcen forums we actually have a freeware tool that we created called PNG Renamer which makes creating compatible dictionaries a breeze; there's instructions in the thread that holds the tool.
I apologize if this has already been asked, perhaps I just missed it. At any rate, if anyone knows, an answer would be appreciated. Thanks.
No worries! I'm going to shift this to the modding subforum so that if anyone else has the same question, they'll find your thread.