yea dont use the actual files that wastes space... but theres a program called "randomizer', I cant remember the exact name. It should be under GTA3 files or something, because it was made awhile back and has a GTA3-style icon. But it works for Vice. You just click the exe after putting it in your vc directory and it does it. Theres no interface or anything.
Its not automatic though, everytime you want the order to change you have to click the exe again before playing (a shortcut next to your mta client shortcut could easily do this though).