I think I found a bug in Printer: while it is possible to manually place papers in its input slot, no pipes or vanilla hoppers can insert them for me. The machine just doesn't accept paper as a valid input.
Also, I thought UV and ZPM batteries were uncraftable but I just found "B:EnableZPMandUVBatteries_false=false" in "OverpoweredStuff.cfg". Why are they disabled by default? I don't need them at the moment as I'm still in the IV age, but to me it makes no sense that just a battery is overpowered, unlike things like higher-tier Solar Panels that can actually generate huge amount of power with no running costs.