I'm not sure how anyone would answer that. Any description that a pilot could give you in a PPRuNe post would be, at best, subjective and, therefore, you couldn't translate it into code. I would suggest you need a GR1/4/4a pilot to work with you and develop your model through an iterative process.
Also, the aircraft has already been simulated so a lot of this work must already have been done.
The test pilots will already have measured things like stick force vs roll rate, pitch rate, stability, etc. Surely that sort of data would make far more sense to a simulation than unquantified descriptions that anyone could give you here.
I'm guessing that you're talking about a computer model for an FSX-style sim?