I'm guessing this has been suggested before, but it really needs to happen. On cell phones it is extremely difficult to change the resource balance without accidentally hitting the "buy resources" button. I just lost 2000 gold for absolutely nothing (I did not need more fish-and I had the money to buy from the market if I did).
I am not a casher, nor will I ever be. All my ingame currency comes from scenario victories which tend to take from 1 to 2 months. If I was someone who spent real money, I would be really upset with the absence of this feature (which is a staple in most games with real money as in game currency.
If any programmers or someone in the development team reads these suggestions, this is an important issue.