> 1) do these things really work (for 100megabit)?
Don't know
> 2) Can I just plug an extra cat5 module into the existing wall socket
> and rewire the cable into both modules, and then rewire the cable at
> the patch panel to use two neighbouring sockets? (instead of using
> the splitter).
Yes
> 3) If I can do this, does anyone have a suitable wiring diagram?
Not to hand, sorry. Try a search on RJ45 pinout.
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