I tried to put endless balls with Cheat Engine, but without success. I have not much knowledge to do it. On the web cheatengine a user achievement put 99 balls but only for the original version. In the pirate version it does not work.
I hope you could make a trainer for this game Pinball FX2 with all the DLC Alien VS Pinball is the last dlc. Sorry for my English, it is to use google translator.