Add some luxury features to vehicle designing

[Arakash]

2. How practical it is to have it as moddable vs a regular feature

Having a game open to modding is always nice, see in GTA series mooding is funny and is one of the best advertising things because people will wanna show what they made, i see a lot of times nice modding in games i 9GAG and a lot of people see them...

I definitely agree.
One of my favourite examples is the Grand Strategy game Crusader Kings 2. After several expansions, it has tonnes of small mods, several absolutely huge balance/improvement mods and a couple of massive Overhaul mods, such as the Famous Game of Thrones mod.
Its really quite impressive what a dedicated modding team with a highly moddable game can do.
My Steam says ive played 500+ hours of that game