Also, for half of those options they said they'll think about it or they'll actually do it if the playerbase really wants it.
While the question for Hempen Underwear wasn't properly understood in the first place and therefore answered wrongly.

I think the only thing that has been outright refused was better textures as they said multiple times that they want to prioritize stability over looks.

To actually answer this I'd like to know what rails and tyres have to do with this. I thought it was character costumization and not how to pimp your ride :x