I would like to add a few 'new' input types to Mame, for example IPT_WHEEL360 and IPT_WHEEL270.  These would be exactly the same as IPT_DIAL and IPT_PADDLE respectively, but would only apply to driving games. In turn I would like the -listxml output to report these types as 'wheel360' and 'wheel270'. Functionally nothing will change, just how the input appears to the user.
I had a bit of a go at this but I seemed to have messed something up  

 When I start Mame I can go into the tab menu but after that controls do not work properly (inc. UI controls such as Escape). I think it might be a change I made in \src\emu\inptport.h:
	/* analog inputs */
#define __ipt_analog_start IPT_PADDLE
#define __ipt_analog_absolute_start IPT_PADDLE
	IPT_PADDLE,			/* absolute */
	IPT_WHEEL270,			/* absolute */
	IPT_PADDLE_V,		/* absolute */
	IPT_AD_STICK_X,		/* absolute */
	IPT_AD_STICK_Y,		/* absolute */
	IPT_AD_STICK_Z,		/* absolute */
	IPT_LIGHTGUN_X,		/* absolute */
	IPT_LIGHTGUN_Y,		/* absolute */
	IPT_PEDAL,			/* absolute */
	IPT_PEDAL2,			/* absolute */
	IPT_PEDAL3,			/* absolute */
	IPT_POSITIONAL,		/* absolute */
	IPT_POSITIONAL_V,	/* absolute */
#define __ipt_analog_absolute_end IPT_POSITIONAL_V
	IPT_DIAL,			/* relative */
	IPT_WHEEL360,			/* relative */
	IPT_DIAL_V,			/* relative */
	IPT_TRACKBALL_X,	/* relative */
	IPT_TRACKBALL_Y,	/* relative */
	IPT_MOUSE_X,		/* relative */
	IPT_MOUSE_Y,		/* relative */
#define __ipt_analog_end IPT_MOUSE_Y
Can anyone point out what I might have done wrong? Still very much learning from a bit of trial and error at the moment.
Edit: BTW I want to do this to make filtering games much, much easier.