Quote: "does fps allow you to add "friends" into the game?"
Yes, search the forum for an "ally script" to get "friends". They'll shoot with you, and not against you.
Quote: "does FPS enable me to create menus, splash screens, and the option of adding introduction movies to spice up the game?"
Yes, you can create your own menus, splash screens...and, yes, you can easily add cut scenes to your games.
Quote: "Can props be added for later use by the player (like a fixed machine gun )?"
You can have interactive objects in the game. you just have to give them a script (and possibly an animation) to get them to do want you want to do. However, I don't think it's currently possible to mount a turret and shoot from it in FPS Creator (at least it hasn't been done yet due to the complexity of pulling it off).
-Kravenwolf
Success is not final--failure is not eternal.