TE-FrostWalkerEnchant will allow you to create Obsidian blocks when walking near/over lava.
If standing on the ground (i.e. not falling, jumping, or flying), any lava blocks with air above within a radius of 2 + Level around the block being stood on will be turned into an Obsidian block, which will automatically be melted back to lava. Don't worry, you cannot mine the generated obsidian blocks.
How to Install:
copy TE-MagmaWalkerEnchant-release.jar into plugins/TokenEnchant/enchants folder.
Recommended Items: Boots