@ScottMan thank you for your quick reply. I got it working. Everything works as should via APP and via switch. I simply bypassed the 4 way switch by wirenut traveler 1 together and traveler 2 together and went master Switch to the satellite #1 and put traveler 2 and load together  And traveler 1 on it own screw. (Like normal instructions) Then turned off breaker and undid the bypass I did and plugged in satellite 2 the same way as satellite #1. In parallel. I think your right and traveler 1 might be used as communication. My big confusion with your explanation was you mention you installed the them in serial. I got it working before I saw your post as I didn't think you would respond so fast. 

Anyway! Thank for your help! I wouldn't have been able to do it without your initial post.

P.s. I suspect it might work for 4 total switches with 1 master and 3 satellites. Haven't tried it but I'm curious what the satellite limit would be.

  @Mopy, that's right. Put the master in the box where your line comes in. The first satellite will have two wires connected to each screw - one being the traveler from the master and the other being the traveler to satellite #2. That is the case for both traveler #1 and #2. The second satellite has the load connected to the same screw as traveler #2 just like a normal KS230 3-way configuration. Hope this is clear.

I agree that tp-link should be addressing this. This configuration has been working great for me for about a month now - so I'm hopeful that it will be stable for years to come. I'm not sure if you can add more switches in line like this - like a normal 4-way switch where you can add as many as you want. I suspect that adding more will become problematic for the internal circuitry (as the switches are operating in parallel) and that is the reason that tp-link does not want to support this as a true 4-way switch. 

  @ScottMan can you please explain a little more in detail. My electrician and I are trying to understand it. Are you saying we need two dumb/sattelite (only 2 screws) switches and one master (3screws)? Are we to replace the the 4way with a dumb/satellite switch. If so, please explain a little more in detail. Thank you for your help and fguring this out. TP-Link should really fill this void out.

  @Carl Would this also work for the 3 way dimmer switches? The KS230. 

  @Blunoz are you able to get the smart actions to work without a delay? I haven't looked into it too much, but when I tried the smart actions there was a several second delay between hitting the switch and the light changing. The hardwiring is much faster - although still not instantaneous like a dumb switch. Also, this method works well when the wiring is already in the wall. I'd love to use the smart actions in other situations, but I can't stand the delay.

  @Rusalka68 - see https://community.tp-link.com/us/smart-home/forum/topic/161800?replyId=1160712

I was inspired by @PatchyFog's awesome video and set up a similar test bed to try some ideas on the 4-way with dimmer configuration. I was surprised to find a relatively easy solution. The KS230 kits come with one master and one satellite device. It's clear that the traveler 2 wire is actually powering the load, as they are wired together. So traveler 1 must be how the switches communicate with each other. Since that communication has to be bi-directional, I assumed the internal electronics on traveler 1 are likely pretty robust and would be able to handle a third switch that could set or sense that line. So, I simply added a second satellite in series with the first and everything worked - all three switches could control the dimming and I could control the circuit using the app. Here's the configuration in order:

1. line

2. master - connections out on travelers 1 and 2, as well as neutral

3. satellite 1 - travelers 1 and 2 connected to switch and output, neutral pass through

4. satellite 2 - takes travelers 1 and 2 with load connected to traveler 2, neutral passes to load

5. load

Note this is essentially replacing the 4-way with a satellite where the input/output travelers are connected together. Unfortunately, I haven't found anywhere to just buy a satellite so you need to buy a second KS230 kit just to get the extra satellite. 4-way switches normally come at a high premium, so this doesn't seem too bad. This configuration could expand to multiple switches, but I don't know what the limitations are for the internal electronics.

I wish the KS230 would work in a 4-way.

Wasted 2 hours today trying to get it to work :(

  @NevHuntre Same here, we were trying to install dimmers in the 4 way setup, but could not get it to work (had an electrician here experimenting but they could not figure it out unfortunately).