Sorry if this seems to be a bit condescending but I really think given what is being said here about what TGC should do for people who spend seventy bucks on a program that the following needs to be stated.
When you buy a car you are expected to know how to put gas in it and change tyres and basic stuff like that. Now if you want to turn your car into a ferrari then you will have to learn about souping up the engine, transmission, suspension etc and this takes a lot of work. However you dont go to the manufacturer and say well why dont you teach us or support us in how to do this so i can have a super car.
Equally there is a price point effective in regards to what TGC provides.
They make two FPS programmes that allow people to learn the basics of game creation. Nowhere on any of their sites does it say that you will be creating left4dead or crysis even though the software might have the ability to get as close as 80-90% of the way there.
If you really want to get under the hood of the software you need to learn programming and use Dark Basic or DBPro and there are discussion forums for people who are doing this.
To put it another way this is like using lego and wondering why you cant learn how to be a master builder using them. Its not that they are limited its just that they are clearly sold as what they are. Given the amount of work put into creating DB and then creating the game software from that you have to understand what the central development focus is.
You also have to do a lot of work, and a lot of experimenting, and testing and learn graphics, lighting, audio techniques as well as have a good plan for how the game will run.
For me, just focusing on the AI scripting has taken over a year to understand the interactivity that is possible.
In short there is no free lunch or easy road.
As for people who are creating real indie games using this tool set I can bet they aren't creating them using the standard models, fx, or AI scripts. They are creating these from scratch and extending the facilities of the existing code using the language it was written in.
People should be thankful that there are people developing system mods and providing them free.
As far as support is concerned, It became obvious at an early point that Vista was not to be the OS it was hyped to be so why would anyone expend effort on something so limited in its appeal. The fact that TGC makes large effort to keep the greater XP DX9 base updated is testament that they do care.
If Win7 DX11 turns out not to be another furphy then you will probably notice a decline in XP support and a drive to promote Win7 instead.
On a final note any good game takes a large team of people and a huge amount of time, and any one who knows nothing about the critical areas of game making (graphics, programming, audio etc) and thinks they can do it by themselves or with a few friends in less time is actually deluding themselves.
reality check
there just has to be light at the end of the tunnel, even if its only a birthday candle....and cake!