I was unable to do it during the beta phase. It seemed like money was a Float/Double number, but trying to freeze the value had no effect. Now that the full game is out, I plan to give CheatEngine another try, but I won't have anything definitive for at least another day or two.
Anyone had more success, either for the beta or the final game? Of course we all want a full trainer eventually, too.
The game logic appears to be completely LUA-based. Someone with expert decompiling skills might be able to make a cheat mod. It also looks like it should be possible to mod the action cards so that they cost less - I will let you all know how that goes.
The final value for money is a double (which means floating point decimal number with double precision), but I suspect it is only the number used to display the amount of money. Freezing this value has no effect whatsoever. Looking at the finances screen shows that the game keeps track of income for every single world region, as well as every single different type of expenditure for every single world region.