Is there anyway to load fuel into a kiln, crucible, oven, with some sort of hotkey (Ender's Client). I've heard mention of it before but cannot recall what combination of buttons it is.
a tip with steel crucibles, either fuel them with sticks, or don't put in the last block, and you'll use a lot less fuel.
The reason for this - each block is 5 ticks, if you put 1 block in when it's only down 2 ticks, you will lose 3 branches worth of fuel, for each crucible