... I don't think we should have to achieve a certain level to obtain the right to change these images. ...
No no no no no.
Not unlockable just to change them.
I understood this thread as: We have X screens from opening splash through to end credits. Each screen will have 0<Y<10 pictures (typically Y≈5; some places may only have 1; others such as opening splash and end credits may have 1 for each race, etc.) randomly selected and displayed.
All I am suggesting is have a handful of events (such as completing a campaign, making a certain number of kills, etc.) to allow some of the screens to have Y+1 (per event) pictures to choose from.
You are right, Adam - locking all the pictures and keeping them from changing is silly, especially since it seems that it is planned for them to rotate on their own out of the box
I only suggest this as it seems that everyone is hung up on achievements within their games (see practically any Steam game). Its just a thought to cater to that audience. Obviously, it doesn't have to be included; something like this would give the modding community something else to do
The Czar