A feature for more realistic lava, and Nether that is configurable. (Adds a nice challenge)

[CaptainRick218]

Two ideas that I think would be great, is to add a configurable option so that if you stand on a block directly next to lava for more than 5 seconds, you'll catch on fire, and moving away from the lava can put you out.

Then another is if you're in the Nether for a configurable time, you'll catch on fire and need to exit the nether, and the timer would reset, or have a fire resistance potion, or fire protection armor.
You could have it set to happen in a configurable time between 5 mins and 60 mins.
And you could have it set to true or false if some people don't like the extra challenge.

Mainly what these optional features would do, is add a nice element of realism and challenge.