Would it be possible to create a game on par with that of the original HL? Complete with heavily scripted events, intelligent enemies, opening menus, puzzles and what not? And can you import any kind of model you want? Say I want to import an alien model, complete with Bone based animation, is that possible? Is it also possible to import different weapon models, and give them destinct damage capabilities, Rates of fire, and Special effects? Is it possible, to Set enemies to shoot special projectiles, or attack you with melee combat? Is it possible to add destroyable objects such as crates, walls, lights, and other animated objects in a level, so that the player could literally destroy the environment? Is it possible to create Cut-scenes, complete with dialog? And that brings me to my next and last question, can we record and play back dialog in a level? So that the enemies could talk to us, or we could interact with an friendly NPC?
Guns arnt the problem, people are the problem, shoot all the people and guns arnt a problem anymore.