I tried making items +15, it works because it looks like it's +15 and the stats are there also in Character window, but they don't actually have any effect...
Maybe the succes of an upgrade can be changed but it is too hard to scan for that because every time you upgrade it is done in like 1 sec
CE is too slow
Also tried to get your own choice on slot filling, doesn't work... It is like the server spins a wheel of fortune for you, with some things on it more often then other... Like rate is the Jackpot
So no cheating is possible there either...