So, when will the banners be finalised?
When they're finalised. Should be a quick job put I've not found the time to do it yet.
Can we decide how to display them or will the organization create a splash screen?
Yes you can display them how you want, whether that's just a static splash screen or something fancy. We'll only be providing you with the banners.
Can a key be used to let the player skip the 5 seconds thing? I bet not many would like to go though 5 secs of splash screen every time they start the game.
The player might not like it, but the sponsors wouldn't like it the other way. Splash screens must be non skippable if we're going to continue to entice great sponsors and prizes in future competitions