Board Thread:Suggestions forum/@comment-29394996-20170312044713

My suggestion is simply this: smoking, torches, cooking, flaming arrows, (and maybe even the harad sun) have a small chance of lighting fires to any directly adjacent very flammable blocks, such as ropes, thatch, straw, wool, etc, some more than others.

As well as this, striking certain kinds metal swords and tools against certain kinds of blocks, as well as using chisels, should strike a spark, in case you can't find any flint. this would only occur with one click of the mouse, not if you're mining the block. 