I don't want to seem disencouraging but you are going to need to have a small team if you want to create the game with the specs you are mentioning above. Anything you require in your game is possible with the Leadwerks engine, although you need to have good programming skills or a programmer who can take care of it.
What do you mean with game play features? shooter, strategy, third person- firstperson, 2.5D games, puzzle, adventure, sports? Because it is al possible.