We've done some additional testing with Trackmania Nations Forever.
The result of that is that a) we have cleaned up the tips and tricks section of this entry and b) we have adjusted the c4p so that it works on both Mac and Linux and points to the Tips & Tricks section.
If you felt that Trackmania Nations Forever did not work well for you, please retest it with the adjusted c4p, following the instructions in the Tips & Tricks section where necessary.
If you continue to experience problems, please let us know by opening a Support Ticket or sending an email to ninjas@codeweavers.com.