Allowing supergrid large maps and giving the prayer some bigger possibilities would be a start IMO...
Secondly allow it some sort of bonus. As it stands the only bonus for mapping is the better looking map and the LP, the LP is barely worth it and the fact that it's not automatic also sucks tentacles.
Nobody wrote:Let's better forbid the nightvision instead of mapping. Torches and candles will be useful again, and it will look much realistic than it is now.
That should be taken care of as well, but not in that fashion either really. Restricting what you can view based on how dark it is around the object would work fine.