Sulfur is somewhat rare, and so can't really be counted on to ignore oil (which you'll still need for plastic anyway), but it does allow the creation of batteries (and so, laser turrets and accumulators) before oil if you get lucky enough to find it - and of course will bolster your supplies if/when you are running low on petroleum gas.
- 0.1.0: Updated to be name-compliant with Factorio, added accommodations for Underground Mining, made prereqs slighty more adaptive toward other mods (moves itself up one level in the prerequisites list)