Well for the most part Ross switches can be bought "Ross Ready" which means they are wired with "jumper wires" underneath the rails of each switch. That simply means that each switch is wired so that power is running through the entire switch with one feed on either of the 3 legs. We bought our switches and ran the jumpers ourselves to make them flow power all the way through. I'm sure you could do the same with the Atlas switches.
Those filters are used to "enhance" the DCS signal, not to stop multiple commands. Many people who use the newer TIU's with the most recent software edition, are not using filters. We have 2 TIU's, Rev L, and don NOT use filters or light bulbs for enhancing the DCS signal, and we still get a 7-10 signal throughout the layout.
I do have an older TIU, from several years ago that has never been upgraded, and I need the light bulb to get the 9-10 signal on my overhead loop in the bar/gameroom.
