Hey all,
You know, for alot of people, this game may be too comlpicated to enjoy. I'm not saying complicated like it's hard to play, I'm saying complicated as in how you customize it. Crosshairs, HUDs, menus, etc. Why don't you just give us a menu for all these things? Like, say you just unzipped a crosshair pack to your directory. Now you want to use it. Instead of going into the game, and typing it in, why not just go to a newly setup menu inside the Settings menu. (Settings > Display > Crosshairs anyone?) And be shown a picture of the crosshair and a checkbox next to it saying "Default" or "Use".
The same can be done with Menus, and HUDs. Just show a list of all that is available, and check the box. Simple, and fast.