Om3n: I'm not sure to follow your whole idea/request, but for string handling you have several system expressions (like in your example sting.split is tokenat(src, index, separator))
It works with any string (coming from an array, a variable, a text object, or anything), was this what you were asking for ?
There are also several other custom plugins to help with such operations/stock but as Gauveldt noted, it's not the best solution if, for now, you're aiming to upload your game to Scirra's arcade.
Hopefuly it is just a temporary drawback.