MiscTweaks allows you to modify certain aspects of Vanilla.

Full list of options:

Specify the initial time and weather of new worlds.
Specify a default difficulty, game mode or world type. Whitelist certain difficulties, game modes and world types, and prevent others from being selected.
Specify default generator options and game rules and a default world seed. Optionally prevent them from being changed in-game.
Set default server properties
Enable or disable cheats, bonus chests and structure generation by default. Optionally prevent them from being enabled or disabled in-game.
Specify the size of chests, ender chests and minecart chests.
Modify the fire tick rate (how quickly fire destroys and spreads).
Add or disable fire sources (blocks which sustain fire indefinitely, such as netherrack).
Set a maximum render distance.
Set a maximum brightness level.
Disable lava pockets in the nether.
Disable sleep.
Modify the amount of damage dealt by each damage source (hunger, drowning, etc.)
Make liquids finite or infinite
Set the amount of health regen given by a full hunger bar.
Set the amount of exhaustion regen given by a full hunger bar.
Prevent players from changing their spawn points with beds.
Prevent players from changing their spawn points at all.
Change the text in the lower left corner of the main menu.
Remove the realms button from the main menu.
Remove the copyright information from the main menu.

MiscTweaks_