Some dispenser suggestions with the new snapshot

I was very surprised to find out that dispensers couldn't pick up lava and water from cauldrons. Making dispensers able to empty/fill cauldrons with lava/water would be a neat feature for redstoners. Another feature I would like added is having dispensers able to activate creepers with flint and steel. You can already light up creepers with flint and steel as a player, and dispensers are able to sheer sheep with shears, so why not be able to light up creepers with flint and steel in a dispenser? that would make for a cool charged creeper farm with the new lightning rod!