How simple should commands be? And how should they be structured?

[414cnewq]

When I needed to activate something via the Xbox 360 controller, I used the wpilib triggers functionality.
My GetTrigger.h (C++)

#ifndef GetTrigger_H
#define GetTrigger_H

#include "WPILib.h"

class GetTrigger: public Trigger
{
private:
	int m_axis;
	Joystick* joy;
public:
	GetTrigger(int, Joystick*);
	bool Get();
};

#endif

And GetTrigger.CPP

#include "GetTrigger.h"

GetTrigger::GetTrigger(int axis, Joystick* Joy)
{
	joy=Joy;
	m_axis=axis;
}

bool GetTrigger::Get()
{
	return joy->GetRawAxis(m_axis)>0;
}

You just declare an object of Type, in this case, GetTrigger in your OI as defined in your constructor and Initialize it like a JoystickButton. If I'm too vaugue, just look in the WPIlub documentation on Triggers here.