How about some kind of combination of redstone and glowstone dust, crafted by combining the two and having the properties of both? It could be placed like redstone yet also glows; to balance it you could make it lose power after a shorter distance than normal redstone (8?). You could also make a sifter or something similar to be able to separate them again (possibly also useful for other things?). Naturally, the dust would be orange (my favorite color ). I don't imagine it being very useful for FTB, seeing as we have cables and all, but maybe combined with other features it could be fun and interesting to play with.