Minor feature request: key press detection

uniform bool bEscapeKeyToggle <source="key"; keycode=0x1B; toggle=true;>; //ESC key

uniform bool b1Toggle <source="key"; keycode=0x31; mode="toggle";>; //1 key
uniform bool b2Down <source="key"; keycode=0x32; mode="down";>; //2 key (true while the key is held)
uniform bool b3Press <source="key"; keycode=0x33; mode="press";>; //3 key (true only the frame the key is pressed)

//The CheckInput method has a switch statement which uses these values
#define CHARACTER_KEY				0
#define QUESTLOG_KEY				1
#define INVENTORY_KEY				2

uniform bool bCharacterKeyToggle <source=VTMB_CHARACTER_SOURCE; keycode=VTMB_CHARACTER_KEYCODE; toggle=true;>;
uniform bool bQuestLogKeyToggle <source=VTMB_QUESTLOG_SOURCE; keycode=VTMB_QUESTLOG_KEYCODE; toggle=true;>;
uniform bool bInventoryKeyToggle <source=VTMB_INVENTORY_SOURCE; keycode=VTMB_INVENTORY_KEYCODE; toggle=true;>;

texture tStoredData { Width = 1; Height = 1; Format=RGBA8; };
sampler sStoredData { Texture = tStoredData; };
static const float2 pixel = float2(0.5, 0.5);

bool CheckInput(int key) {
	//Locations of key data in tStoredData
	//	> Pixel 0:	r=Character Sheet key		g=Quest Log key			b=Inventory key				a=UNUSED

	//If the key data from last frame is different from the key data this frame, the key was pressed!
	switch (key) {
		case CHARACTER_KEY:
			return (tex2D(sStoredData, pixel ).r != bCharacterKeyToggle);
		case QUESTLOG_KEY:
			return (tex2D(sStoredData, pixel ).g != bQuestLogKeyToggle);
		case INVENTORY_KEY:
			return (tex2D(sStoredData, pixel ).b != bInventoryKeyToggle);
	}
	return false;
}

float4 SaveDataPS(float4 pos : SV_Position, float2 uv : TEXCOORD) : SV_Target {
    return float4(bCharacterKeyToggle, bQuestLogKeyToggle, bInventoryKeyToggle, false);;
}

technique VTMB_UIMask_Bottom {	
	pass ShaderPass{
        VertexShader = PostProcessVS;
        PixelShader = MaskingPS;
    }
	
	//Write this frame's input and state data to tStoredData for use next frame
	pass SaveData{
        VertexShader = PostProcessVS;
        PixelShader = SaveDataPS;
        RenderTarget = tStoredData;
    }
}