I don't really see how LASER would improve the game. It's already been said that anything travelling faster than photons will cause glitches (photons already do with the clone/stamp bug). It isn't hard to make photons hot. And anyway, photons already spawn at 922 C - enough to melt metal if applied consistently.
I personally don't like most of Ark5's ideas because I don't see how they would add any value to the game.
On that note,
Finalflash50:
You use the line tool to select which direction it can go.
This would be a cool idea for photons - if the user doesn't use the line tool, it spawns in 8 directions. If the user does, it travels to the direction the user pointed to.