Please comment yes or no. :)
The verdict is.... Yes, custom splash screens are allowed!! :D
I mean that would be nice. That's usually one of the first things I do when I make a new game, but at the same time, it's such a minor detail that I don't think it really would matter. I guess I lean more on the side of no for this one. It's still not rtp and though it would be cool and it's only one custom image, I think it's best to not keep adding more and more small exceptions :o lol
I'm going to say Yes. Like someone said, it's not different from putting cover art on the download page. It's not a part of the actual game and I assume people who would put a splash screen there would already have a logo made.
Personally I won't do it because I don't have one made, but I don't see why people who already have one shouldn't be able to slap their name on their game.