It is possible to use 4 touch zones on 1/2/3 gang relay versions

[nstrelow]

As described (in the video I think), the touch sensor seems to have 10 zones, so technically up to 10 programmable touch fields could be used.

So I assume that one can also use 4 touch fields on a switch that only has one relay.

New face plates can be bought on itead, so one can get a black star or the animal 4 touch fields plate to replace.

I just realized this and wanted to share it. I'll test it some time if face plate switching works (I have a 3 relay one, and a few 4 relay plates).

But could be super useful for folks that want more touch (maybe building their own faceplace)

[barth11]

Imo you'd have to tweak the code a bit so it doesn't try to switch on/off the relays but theoretically speaking you can have up to 10 zones.

sonoff-tx-ultimate-for-esphome/tx_ultimate_local.yaml

Line 799 in 1723392

lambda: "return ${relay_count}==3;"

Extending this part would be a good start because you can just reuse the 3 size and add new part with 10 where you'd put 10 "ifs" to handle each touch field.
If you are happy with 4 then you can just use code of others who have it but I don't know it so in detail to tell if it wouldn't look for the 4th L relay.

[nstrelow]

I use this one for my 4 relais:
#55

You can set those variables:
toggle_relay_1_on_touch: "true"
toggle_relay_2_on_touch: "true"
toggle_relay_3_on_touch: "true"
toggle_relay_4_on_touch: "true" <== this needs to be false

And then maybbe some switch should be cleaned up.