But currently when there is a race, admins are already offering teleports to the start point...
Also, to avoid abuse of this feature (for example someone who is about to die asking for teleport only to save himself), instead of giving this ability to only certain players (as you suggest), you can enable those teleports inside banks and Ammus, because inside them you can't die, so you cannot abuse them to avoid death. This way everyone would be able to use those teleports.