I think he means your sig, but we allow sig adds there most of the time (no porn or anything)
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As for EL wires, I have never used one. But, cutting the shielding shouldn't do much. I completely removed the one on the lid, and poked holes in the back to add a cathode and mod switch. It is meant to shield electronic interference, but I don't know anyone who had a fuzzy tv picture when the xbox had lost the lid.
I don't think they should melt. I put hot glue right above the power jack inside the xbox to hold a switch in place, and that hasn't even started to melt yet.