Just a thought/question, it looks like a nice GS that could be extended to "replace" subsidies for those of us who play with cargodist
The fundamental problem of cargodist stays unsolved of course, that is, you may not get any cargo to the destination, or when cargo passes through a subsidized station on its way to other destinations, does it count as "delivered"? (Current answer: no)
See also http://bugs.openttd.org/task/5766#comment12666
I don't know if it is solvable at all, tbh. If it is, it's probably better to fix subsidies themselves.
me question is, how difficult would it be to increase payment for deliveries during the source to fulfill the goal ( like standard subsidies) IE delivering 1580t coal to a power station, while the quest is active you get double payment, once the 1580t is reached payment revert to normal
Impossible, as the script only gets amounts delivered, and not how much you got paid for it. As such, the script has no way to determine how much to pay you to give the double amount.
If you settle for a fixed amount of money, that could work. It's actually even quite simple (once you decided how much you'd get). The question is however, what's the point? In any OpenTTD game, you can pretty soon fill the sea with money, why would you need more?
As it is now, you can just ignore the goals if you don't like them, and build routes you want to have. It makes the GS nice for casual sand-box style playing. We don't have many GSes for that yet.
I don't know how andythenorth feels about it, but I have no objections to adding a patch to add payment as an option, if someone makes it. I won't develop such a patch however.