modify options interface

[mpo]

I have interfaced Vdrift with an helmet for the virtual reality, but now i need to implement an interface to set some parameters (set visuality, sensibility..).
I have watched the code, but i have some difficulties in understanding which files i have to modify to, for example, insert into the options/controls interface, a button called "helmet", that it sends me in an other window where i can set these parameters of the helmet.
Another solution could be use a predefined combination of keyboard buttons that set the parameters.
Any idea or observation is good for me..

thanks.