@knghifi I believe that shorter cable runs are more desirable in RCA signal cable, especially phono and speaker. In balanced signal cable I think it is much less so. For instance, I am having HFC make me some 7 meter long balanced Reveal signal cables and I asked them about bang for the buck by adding an additional wave guide and they talked me out of it but said it could be done. They just thought the investment could be better spent elsewhere.
Which brings us to power cables. Yes, I was informed additional wave guides could also be added to power cables. They did not push back from the idea of making a very long run of power cables with regard to compromising the quality of the signal. Indeed, my impression was that a longer power cable run was no problem, but again, a longer RCA (as opposed to balanced) signal cable, as well as speaker cables, could be problematic.
In conclusion, I believe they will indeed add wave guides to RCA signal cables, speaker cables and power cables. I was quoted a price for the additional wave guides but I think it more appropriate for you to give them a call because I am not comfortable quoting custom pricing here. Also, my discussion of pricing was simply for the Reveal line. Call them, they’ll discuss it.