GlobalTrader 

, however, it also has inherent problems, such as most people trading sim are too relaxed about their rules and ...

As you mentioned sim trading is not a problem.
People are the problem because they don't take sim trading seriously.

I started out day 1 with live trading and that I learned :
- I didn't no how do trade.
- I didn't have a discipline to follow my plan
- I losed lot of money.

I would have got same lessons learned starting with sim trading.
But without losing lot of money.

Does any one know the algorithm that runs the TAS?

Perhaps we can code it for cheaper usage.