Sadly, at the moment everything you define in MapType is overridden by default Race gametype (except manialinks and objective entering - medals).
Other problem is that in TrackMania modes it's not even possible to choose where the Player may spawn. He can be wether unspawned or be spawned in the start block. Also, there is array of finish blocks positions, but the start block position is only one and not even as an array.
Would be so nice to have CTmMapLandmark in TrackMania. It was planned for the first Pursuit release to spawn players in random spawns, but ofc it's not allowed.
Random stuff:
To be honest, if you open TrackMania map in ShootMania, you can select Melee MapType and place as many starts you want.

Even testing a map with Melee script allows you to play usual deathmatch, eg. in Stadium. Bah, the finish is acting as Pole but it's not possible to access its Gauge.

And you wont play with bots, because pathfinding doesnt work here.