When using some mods you have a need for at minimum 5 ores such as the ones I am using which is a combination of 5dims with some elements of bobs. In this case Tin is a crucial early game ore in addition to all the normal base game ores, there are additional ores like gold uranium and bauxite but those are not crucial for the early game.

Is there a way to have it spawn more than 4 ores in the starting area?

Not currently, but I plan on allowing 8 spawn ores.

As a temporary fix, you could repeatedly generate worlds until you get one with the 5th ore easily accessible in a nearby maze.

Thanks for the advice, I tried that but the complexity of ores I'm using is problematic with this mod, I plan on nyxing the extra ores on my next playthrough for now.