You know, I was thinking about the lavaforge stuff (just randomly) and I thought about whether there are other good ones to replace the now broken lavaforge. So, I found two that actually have the same kind of functionality.
DwarfForge Using Lava Dwarf Fortress style
I mainly picked this one because I like Dwarf Fortress
No idea if buckets still get devoured or not.
LavaFurnace (main thread) BukkitDev page This one, I like better than the other one because it is much closer to the functionality of LavaForge, however, instead of just making it work for the normal furnaces, its a whole new furnace.