I dont see anyway to diasble the game starting box, but you can substitute it for a different picture, which you can create yourself, or use one already created.
The picture can be gif, jpeg, png, etc.
Just pick the picture you wish to use and remember where it is stored on your hard drive.
In mala:
Options-Configuration/GUI/Game start/quit
Check "use full screen starting picture instead of starting window".
Then browse to where your picture is stored, and choose it.
You can select pics for horizontal and vertical orientations.
I havent tried it but if you make a picture with nothing but a black or white background, maybe this will do what you want?