How can I stop lava creating fire?
Solution 1:
This is not a bug. The doFireTick gamerule controls the spread of fire, not the creation of fire. Lightning, lava, and, more importantly, flint and steel, can still set things on fire, even with this gamerule set to false. The only real way to circumvent this is to avoid placing burnable blocks near lava.
Solution 2:
status-bydesign
This was reported before. It was closed as a duplicate of another bug report, where Dinnerbone explicitly states:
This is the intended behaviour of doFireTick.
So no, I don't think will be fixed in 1.8 or any other version.