How do I mimic a flint and steel?

I've got an item that acts *almost* like a flint and steel when right-clicking a block and spawns lightning when sneak right-clicking a block. 

The problem is that in order to act like a flint and steel I'm spawning a "fire block" at y+1 in relation to the block right clicked, but with a normal flint and steel, fire can be placed on the side of blocks as well. I tried looking at the actual code for the flint and steel, but I couldn't completely decipher it.

So any help with this would be great.

I'll attach an image of my procedure code: 

http://prntscr.com/ny2e30