Why would adding an extra button increase the learning curve? Newbies can simply use 5 + fire if the RF button confuses them. If this is still a concern, an option for disabling the button could be coded in (the button could be disabled by default, but it should be clearly stated in the readme that such a facility exists). When one has mastered the basics of gameplay, learning a new button should not take very long (I'm not an expert here, but that's what I think). In my opinion RF climbing/jumping is a useful trick/tactical element that should be practiced and incorporated into the gameplay more. People can already change weapons pretty fast (at least I can do it in a fraction of a second; the default key configuration helps here), so I don't think a new feature like this would be a big problem.