I have a suggestion. Maybe you should add a feature where you can toggle whether the windows are up or down.
Highly pointless. For the amount of time and effort it would take just to implement such a tiny feature, it would certainly not be worth it.
You could utilize the parts system by having windows separate from the doors, so they could be removed, which is like having the windows down. I am considering doing this for when I make my mods
I wouldn't say its pointless, from an immersion standpoint, but I do agree that the time it would take for this to be accomplished should be spent optimizing and adding new cars/content, rather than something that is offered in TDU but is rarely used. Would be nice though, perhaps a community member would know where/how to begin working on this?