Slimeballs smelt or extract to rubber i don`t think that this idea should break game and it coulb make slimes more usefull to hunt 
also there could be more items in scrapboxes and for smp MFU bug dont use suc integers as 60k EU but use 0.006 EU and usages like 0.00000002 (i think i added too much 0 :D) i mean that all power usage storage and output could be power/100
and some detector wire if it is powered it activate redstone so then we could make sun detectors, check if there is any power in MFUs or reactors and make signals in bases
sorry about that crapy english