New sensor/virtual device type

[Domange]

Hello,

I'm quite new on Domoticz and I have some trouble with standard sensors.

For example, I can retrieve by a script the air quality, but it is not only Co2 information and the scale is from 0 to 10 (best to worth)
How can I create a new sensor type indicationg the quality in a color scale and/or in name scale.

Another example, I have a distant switch with 4 positions. i know how to set it in different position by script but how can i represent it in Domoticz ? not only on/off but "Off", "night", "day" and "low temperature".

Thank you