1: The reason why that's happening is because the script is linked to an unfinished MDC system from Palm Beach Games, it's not necessarily a bug per-se but it's more of a we need to actually finish / make the script for it to be "fixed".
2: I'll look into it for 1.3.0, no promises.
3: The economy is indeed a bit of a mess, especially since money seems to disappear due to a money bug from time to time. We made some minor adjustments for it in 1.3.0 and also fixed the annoying money bug, after that we'll look into the economy aspect further on where it could be improved and what not.
4: That model would cause more chaos than good as players could potentially abuse such a big object and bug out the NPCs I'm afraid.
5: I'll look into it, thanks.