Does oil have to be restricted to Biome (or biome types)? What about having different weights for each biome type, so it's just more likely to find oil in specific areas, but you can still find some anywhere if you hunt for it.Yeah, but that makes it harder to find BC oil.
Perhaps underground deposits in taiga biomes aren't such a bad idea...
I do agree with Shneeky's suggestions above. Branch out what can be done with Oil. Maybe change the progression with in the mod to require oil based products in the crafting recipes of later game items so that BC is not just restricted to vanilla materials in it's crafting recipes.
On the laser system, what about having the ability to build a "clean room" around the laser system, which increases efficiency of said laser system? Entities should also take damage from the lasers. Could then also be expanded to laser barriers.