Thank you very much for the links, that's very kind
After downloading and testing all these tracks I decided that I will try to edit Phakisa, Lemalands, Mount Drama, Toban and Wakefield, if I have enough time for everything. Losail and Kastleburg don't really look good enough to spend time editing them, hopefully these harsh words don't upset anyone.
Euro Ring looks absolutely awesome, but it seems that the mod creator has updated the track himself and now it has 30 pits, great! Only remark I have is that I very often got some weird, purple-pink textures on some of the curbs and tarmac, but maybe it will be fixed.
So, to sum up - the list of things to do expands in almost the same pace as the universe. I will try to complete it though. However, first I need to learn how to edit these tracks in such a way, that it won't upset multiplayer gaming, as
@slider666 rightfully pointed out. Wish me luck