I really like aesthetic of Japan rally,

So i was thinking how to have more of that maybe we can get something of a spectacle type track. You know like https://en.wikipedia.org/wiki/Yungas_Road (road of dead) - with cliff side drop and basically no protection from falling, should make for amazing scenic view.

Or any of the mountainside carved roads such as https://en.wikipedia.org/wiki/Guoliang_Tunnel.

+1 for that. Some people on the steam forums were complaining that the tracks are boring/easy, so I thought adding an "expert" track in every location would be cool. And a natural extension of the game. Wouldn't mind if it's a paid DLC. We're still missing the Volkswagens, Nissans, some Russian cars and more Corollas anyway, so there's a lot of stuff begging to be added. :)

I would use something along the lines of CMR strategy - each difficulty having its own set of tracks (or at least add few more difficult for each step), with the hardest having narrowest and or otherwise more difficult.

Generally adding it to all difficulties could end up casing people with tragic lack of skill (ex.:myself) bit too much frustration.

Tho if balanced well and training drivers to do better it may be fair enough.

I was thinking more about scenic routes than difficulty but you are correct what i suggested would've make things more challenging.