I haven't heard of any that allow custom splash screens, since they use that as an advertisement to help keep the brand name in the forefront of your thoughts.
Can you send some pics of all the bios tabs?
When he says he's not going to cover ways to do it when there isn't custom software from the motherboard manufacturer because it's "somewhat risky" he is fully correct. Acer and Gateway don't provide any apps to do that kind of tweaking and if the image size isn't exactly the same as what's embedded in the stock BIOS you can easily end up with a big, heavy brick.
What the Gateway support site shows is that they didn't do a BIOS update after the initial release, so what you have is already the latest.
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