Well, I'm working at the model of "Tuk-Tuk". That's taxi in Thailand (moto-rickshaw "Tuk-Tuk"). The model is almost ready, but I can't use it as taxi, and I can't create it as taxi without replacing default taxi cars.
Screenshots (source and some variables of recolors):
I think, it could be the good thing for the new stuff, for example the new world "The land of smiles" like Pattaya (the city of Thailand) with some Thai attributes. So maybe you, dear developers, could give us the option for customise taxi (like we can customise the weather or the life length for sims/pets, or somewhere in CAW) for use them in worlds we set them only, and not in all worlds?
Or just maybe, if you're interesting this idea, we could work together?