Seems nice and all, but to be very honest €14,00 is a little bit too much for a mod when the engine itself costs around €30,00 these days. Sure it works nicely and a lot different from what I've heard, but in the end it's still the exact same engine but a little more polished... In the words of Yahtzee Crosshaw "You can polish a turd but it'll still be a turd.". By this I mean no offence to your mod, nor FPS Creator in general, however I am just letting out my opinion.
On a more bright side, you've incorperated some nice mods into this, and have probably spend hours of debugging the source. The feature list looks sleak as well. However, for that amount of money it would be nice if there were graphical improvements as well, such as support for more shaders, Anti Aliasing(<--- Very FPS intensive, but since this seems to be running around 300 to some people that shouldn't matter too much, as long as it can be disabled as well) and such. I know this is asking a lot, I am however just adding some of my ideas to this project, and to make it worth the money some more.
Maybe I've turned into a cheapskate in the time I've been gone, or maybe I've seen far more advanced stuff for much cheaper, either way... Once again I am NOT bashing your mod, it looks great and kudos on that, But this is my personal opinion.
It's not the world that turns against you, it's you that turns against the world.