Balanced islands map?

[PekkaM]

I love playing balanced maps since being not very expansionist I can still get all the important resources on them (only problem is that oil seems to be all sea oil on those maps). I'd like to expand this idea to islands map. The problem is that playing small islands I always seem to lack many important resources, luxuries and food.

Basically I want single player islands (could have an option for multiple player per island to get some early conflict) with guaranteed copper, iron etc. and a balanced share of other goods on them.

Could this kind of map type be easily modded into game?