Well is there any cheat script lol..
Like most PS1 cheat do? press something at the start thing and if it correct a sound will confirm and you get the stuff?
It wouldn't be very hard for someone to write one which stores the cheats in $game_switches or $game_variables (That's your switches and variables within the editor)
He's right; this wouldn't be hard to do provided you have other scripts that can help and whatnot. There are a lot of Cheats scripts throughout RMXP.org and Creation Asylum if I recall correctly, but I don't think they do what you want in particular (That is, button combination at the title screen).
If you want one of those exact combinations, like typing 'hidden test' in the Microsoft XP Pinball game (For example), you would need some script that maps the whole keyboard...Erm, Cybersam made one I think? That's in .ORG too...I can't provide anything, but I can do a little hint here and there I guess. Sorry.
If the combination is pressed, a global switch/switch is turned on which allows the Cheat Menu to show~ Whee, obvious idea.
Or any of Blizz's keyboard implementations.
There's only one. o.o;
Blizz-ABS has a slightly different one than Tons, I'm sure :V
The slight difference doesn't even quality it as a different edition, IMO. xD