Oh god, this is extremely old, but yeah.
http://forum.cheatengine.org/viewtopic.php?t=458586
I used one variable HUD i made ages ago that would update every second, and pretty much did edits to it for each variable. I then used events to modify the variables on each map (So let's say every second, hunger would go down by 1, every 3 seconds sleep down by 1, etc.
I would then use Mephistos house script version 1.6 to place furnitures and stuff that would increase variables. Furnitures like a fridge would call a shop that sold only food, which would increase Hunger in a different way than others. Beds would increase your sleep by a handful of points, but you're stunned i guess.
I then took the same exact pack of scripts and started work on a survival game set on a stranded island. This worked just as well, as i increased the amount of features and decreased the amount of lag.
Then my computer crashed, and i bought a new one.
I'm now working with the same setup as before, but now for a Dungeon keeper style game called Trappers keep.
Anyways, i made this ultra long post just to say that even though it may be difficult, your work can pay off. Anything is possible as long as you can imagine the best way to do it.