for BAD DUMPS, NO DUMPS, NOT WORKING, SOUND Not Working, WRONG Colors,etc..., you can't disable that (unless you use a UN-Official Build that disabled it). The reason for this is to illiminate reports game not working, or sounds not working, colors not right etc...cause it already inform the users at the promt about whats wrong with it.
You can only disable the Game Info, look in the MAME.INI most like at the bottom of the list something along this line SKIP INFO etc... change 0 to 1.